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Prepositions after verbs

Weigh on, weigh in, or weigh against?

These combinations have different meanings related to pressure, opinions, and comparison.

Quick answer

What is the difference?

Weigh on means cause worry or pressure. Weigh in means join a discussion or give an opinion. Weigh against means compare one thing with another when deciding.

Debt can weigh on a family.
Several experts weighed in on the issue.
We must weigh against the possible risks.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
weigh on + person

Causing emotional pressure

Weigh on describes something that worries or burdens someone.

The uncertainty weighed on investors.
Guilt weighed on him for years.
2
weigh in + on topic

Giving an opinion

Weigh in means to join a discussion or debate.

Scientists weighed in on the proposal.
She refused to weigh in on the argument.
3
weigh against + factor

Comparing disadvantages or risks

Weigh against is used when balancing one factor against another.

We need to weigh against the long-term costs.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
weigh on
Rising prices are weighing on consumers.
cause stress or concern
weigh in
The editor weighed in on the controversy.
give an opinion
weigh against
They weighed the benefits against the risks.
compare carefully before deciding

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Confusing weigh in and weigh on

Weigh in is about opinions, while weigh on is about pressure or worry.

✕ The problem weighed in on her mind. ✓ The problem weighed on her mind.

Omitting against after weigh

Use against when comparing two sides of a decision.

✕ We weighed the risks the benefits. ✓ We weighed the risks against the benefits.

Quick practice

Choose the expression that matches the intended meaning.

1. Financial stress can ___ employees.
2. Several doctors ___ the policy.
3. We must ___ the costs ___ the benefits.

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Frequently asked questions

Can weigh in be used without on?

Yes. Weigh in alone can still mean join a discussion.

What does weigh on your mind mean?

It means something is causing worry or emotional pressure.

Is weigh against always about decisions?

Usually, yes. It is commonly used when comparing options, risks, or benefits.

wade, through, wade, into wait for, in, on, at or till? wake up, from, in, at or by? walk into, in, to, through or on? wander through, around, into, in or from? "want for", "want from" or "want in"? "warn of" or "warn against"? "wash with", "wash in" or "wash over"? "waste on" or "waste in"? watch for, in, on, from or with? "wave at" or "wave to"? "weaken by", "weaken to" or "weaken of"?

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