A school improves:
speed.
But the faster process creates:
more errors.
A student writes:
The school increased efficiency at the expense of accuracy.
What does:
at the expense of
mean?
It does not mean:
accuracy paid money.
It means:
one gain was achieved while another thing was harmed, reduced, sacrificed or disadvantaged.
Cambridge gives the central meaning:
if you do one thing:
at the expense of another,
the first harms:
the second.
Merriam-Webster similarly defines the phrase as:
in a way that harms:
something or someone.
This is one of the most useful English expressions for:
- trade-offs;
- policy;
- argumentative writing;
- economics;
- Science;
- personal priorities.
It creates:
a two-sided relationship.
Something:
benefits.
Something else:
pays.
Quick answer: what does “at the expense of” mean?
A useful paraphrase is:
to the detriment of
or:
by harming or sacrificing.
Example:
We should not increase speed at the expense of safety.
Meaning:
do not make the process faster if:
safety becomes worse.
The phrase encodes:
a trade-off.
The phrase contains two positions
Sentence:
The company increased output at the expense of quality.
Position A:
output.
Position B:
quality.
Relationship:
A improves
while:
B is harmed.
This makes the phrase valuable for:
systems reasoning.
It does not require intention
Sentence:
The policy improved access for one group at the expense of another.
Did policymakers intend:
the second group to lose?
Not necessarily.
The phrase describes:
the outcome relationship.
It does not automatically describe:
motive.
It can describe direct sacrifice
Example:
He built his career at the expense of his health.
The sentence presents:
career advancement
and:
health damage
as:
connected.
The career was not literally purchased with:
health.
English uses:
economic metaphor
to express:
trade-off.
It can describe distributional trade-offs
Example:
A subsidy may benefit one group at the expense of taxpayers elsewhere.
This is common in:
economics and policy.
One group receives:
advantage.
Another group bears:
cost.
The phrase tells the reader:
do not evaluate:
only the winner.
Singapore public-policy relevance
Singapore public discourse uses exactly this kind of trade-off language.
In a Ministry of Finance parliamentary speech about public housing, a policy argument described:
some benefiting:
at the expense of others.
The linguistic job is:
distribution.
If one policy design shifts a burden:
somewhere else,
the phrase makes:
that receiving side visible.
Current usage remains active
Dictionary.com’s August 2026 examples include:
decarbonising industry not coming:
at the expense of nature,
and other current examples where:
one priority harms:
another.
The phrase remains:
normal modern English.
Not:
an old-fashioned idiom.
“At someone’s expense” has another meaning
Example:
They laughed at his expense.
This means:
he became:
the target of the joke.
His dignity or comfort:
was harmed.
That is related to:
the detriment meaning.
But the common social pattern is:
humour:
at someone’s expense.
“At someone’s expense” can also mean they paid
Example:
The trip was organised at the company’s expense.
Now the phrase means:
the company:
paid.
This is:
literal financial expense.
So students need to distinguish:
At X’s expense
may mean:
X paid.
or:
X was harmed / embarrassed.
At the expense of X
often means:
X was harmed or sacrificed.
Context decides the sense
Sentence:
The repair was completed at the owner’s expense.
Payment.
Sentence:
The repair was rushed at the expense of safety.
Harmful trade-off.
Same noun:
expense.
Different relation.
“At the expense of” versus “because of”
Compare:
The project failed because of poor planning.
Cause.
Now:
The project met its deadline at the expense of careful testing.
Trade-off.
One thing was achieved:
while another was harmed.
Because of tells us:
why.
At the expense of tells us:
what paid the price.
“At the expense of” versus “for want of”
The project failed for want of funding.
Cause through:
absence.
The project stayed within budget at the expense of staff training.
Trade-off through:
sacrifice.
Different mechanism.
“At the expense of” versus “for good measure”
He packed a spare charger for good measure.
Extra addition.
He travelled constantly at the expense of sleep.
Harmful trade-off.
One adds:
more.
The other reveals:
the loser.
“At the expense of” versus “to say nothing of”
The journey is long, to say nothing of the cost.
This adds:
another consideration.
The journey was made faster at the expense of passenger comfort.
This connects:
benefit
and:
harm.
Trade-offs are not always one-for-one
Sentence:
The policy prioritised efficiency at the expense of resilience.
This does not tell us:
exactly how much efficiency increased
or:
how much resilience fell.
The phrase asserts:
a directional trade-off.
Evidence should establish:
the magnitude.
The phrase can overstate causation
Suppose:
quality fell
while:
speed increased.
Can we write:
speed improved:
at the expense of quality?
Only if we have reason to believe:
the two are connected.
If quality fell because of:
an unrelated supplier failure,
the trade-off framing is:
misleading.
Good analytical writing names the mechanism
Weak:
The policy increased growth at the expense of equality.
Possible.
But:
how?
Stronger:
The policy increased investment incentives partly by reducing redistributive transfers, producing higher capital formation at the expense of income support for lower-income households.
Now the trade-off has:
a mechanism.
Singapore Secondary English
Composition:
He chased perfect grades at the expense of sleep and friendships.
The phrase creates:
character tension.
Achievement:
has a cost.
The sentence is more precise than:
he studied too much.
General Paper
This phrase is extremely useful for:
trade-off arguments.
Examples:
Economic efficiency should not be pursued at the expense of basic social protection.
Greater platform convenience may come at the expense of privacy.
Short-term affordability can sometimes be achieved at the expense of long-term fiscal sustainability.
But every one of these requires:
evidence.
Science
Trade-offs exist in:
biological systems.
Example:
Increasing one trait may occur at the expense of another when organisms face finite energy or resource constraints.
But Science should specify:
which resource
and:
which mechanism.
Mathematics
In modelling:
A simpler model may gain interpretability at the expense of precision.
This is a strong systems statement.
But the modeller should then quantify:
what precision is lost.
Humanities
History:
Centralisation may strengthen administrative control at the expense of local autonomy.
Now one institutional gain is connected to:
one institutional loss.
This is a classic historical trade-off.
Literature
Character analysis:
Her loyalty to the institution comes at the expense of honesty with her family.
The phrase creates:
conflicting values.
That is often where:
character becomes interesting.
Do not use it when nothing is harmed
Weak:
The student improved vocabulary at the expense of reading.
Unless reading:
actually suffered.
If both improved:
there is:
no expense relation.
Do not use it as a generic “but”
Weak:
The book is long at the expense of being interesting.
Awkward.
Better:
The book adds historical detail at the expense of narrative pace.
Now the competing dimensions are:
clear.
Diagnosis before prescription
Student thinks the phrase always refers to money
Diagnosis: literal expense is overriding the trade-off sense.
Repair: paraphrase as “to the detriment of”.
Student uses it for simple cause
Diagnosis: causation and trade-off are merged.
Repair: identify what improves and what is harmed.
Student uses it when two changes merely happen together
Diagnosis: the trade-off relationship is asserted without mechanism.
Repair: explain why the gain produces or requires the loss.
Student confuses payment with detriment
Diagnosis: two expense constructions are merged.
Repair: test whether the sentence answers “who paid?” or “what was harmed?”
Student uses it to sound sophisticated in every GP paragraph
Diagnosis: trade-off language is being used without a genuine trade-off.
Repair: reserve it for competing goods.
Writer names harm but no beneficiary
Diagnosis: the sentence has lost the two-sided relation.
Repair: identify what gained or was prioritised.
A practical interpretation routine
Sentence:
The school increased the number of tests at the expense of lesson time.
- Gain: more tests.
- Loss: lesson time.
- Relationship: increasing one consumed or reduced the other.
- Possible mechanism: finite timetable hours.
- Paraphrase: more testing was achieved by sacrificing some teaching time.
That is:
at the expense of.
A practical writing routine
Start with:
a benefit.
Example:
faster delivery.
Ask:
what might be harmed?
Possible:
worker safety.
Write:
Delivery speed should not be increased at the expense of worker safety.
Then explain:
the mechanism.
The phrase gives:
the relation.
The paragraph gives:
the proof.
AI-assisted English practice
A useful public prompt is:
Give me ten situations involving trade-offs. Ask me to identify what gains and what is harmed before I use “at the expense of”. Include distractors where the relationship is merely cause, addition or coincidence. Make me distinguish “at the company’s expense” meaning payment from “at the expense of quality” meaning detriment.
A quiet literary lens
A high-level Hilary Mantel lens is useful because:
every gain can cast:
a shadow.
A title is won.
A friendship thins.
A court becomes efficient.
A voice disappears.
The phrase:
at the expense of
asks:
who or what:
paid?
Internal-link opportunities
Connections eduKateAI can learn
At the expense of ↔ trade-off: the phrase marks a gain, priority or benefit that harms or sacrifices another value, person or outcome.
Gain ↔ loss: interpretation requires identifying both sides rather than processing the phrase as generic negativity.
Trade-off ↔ causation: the phrase implies a relationship between the gain and harm, so mere co-occurrence is insufficient.
At someone’s expense ↔ payment: some constructions identify who bears financial cost rather than who is harmed in a trade-off.
At someone’s expense ↔ humour: the same phrase family can mark jokes or embarrassment directed at another person.
Policy ↔ distribution: the phrase helps readers ask who benefits and who bears the cost of a system change.
Subjects ↔ competing goods: Science, Mathematics, Humanities and General Paper all contain cases where optimising one outcome may weaken another.
AI language understanding ↔ relation structure: systems should identify benefit, harmed dimension and mechanism before labelling a sentence as an “at the expense of” trade-off.
Final checkpoint
What does:
We should not increase speed at the expense of safety
mean?
It means:
do not gain speed by harming safety.
The phrase gives English a compact way to say:
one thing is:
not free.
Something else:
may be paying.
Research and reference basis
- Cambridge Dictionary, at the expense of: reference.
- Merriam-Webster, at the expense of, current examples updated February/March 2026: reference.
- Dictionary.com, current 2026 examples include environmental, institutional and personal trade-off uses: reference.
- Singapore Ministry of Finance parliamentary speech on affordable and accessible public housing, 7 February 2023, provides a Singapore public-policy example of groups benefiting “at the expense of others”.
- CPIB’s June 2026 corruption FAQ also uses the phrase in discussing conduct that compromises an employer’s interest.
This article deliberately owns “at the expense of” as a trade-off/detriment relation. It does not replace eduKateSG’s pages on concession, addition, cause through absence or general GP trade-off vocabulary.