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Prepositions after verbs

mull over and related forms

Mull over is the standard expression meaning think carefully about something.

Quick answer

Which preposition follows mull?

Use mull over to mean think carefully about something. Mull about appears in some regional varieties but is less standard. On, for, and by are not usual complements after mull in this meaning.

She needs time to mull over the proposal.
They mulled over several options.

Choose the pattern by meaning

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

1
mull over + idea

Thinking carefully about something

Over is the standard particle with mull in this sense.

He spent the evening mulling over the offer.
2
mull + object

Using the verb directly

Some speakers use mull directly before the object, especially in informal style.

We need to mull the decision a bit longer.

See the difference in context

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

Construction
Example
Meaning
mull over
She mulled over the problem.
Standard expression meaning think carefully.
mull about
He sat mulling about the future.
Less standard and more regional than mull over.
mull on
She mulled on the issue.
Generally nonstandard in current English.
mull for
They mulled for several days.
For can introduce duration, not a fixed combination.
mull by
He mulled by the window.
By indicates location, not a verb pattern.

Common mistakes

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

Using on instead of over

Over is the usual particle after mull.

✕ I need to mull on it. ✓ I need to mull over it.

Using by as a complement

By does not normally follow mull in this meaning.

✕ She mulled by the idea. ✓ She mulled over the idea.

Quick practice

Choose the expression that matches the intended meaning.

1. We should mull ___ the proposal before deciding.
2. They mulled the idea ___ several weeks.
3. He sat by the fire mulling ___ the news.

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Frequently asked questions

Is mull over idiomatic?

Yes. It is the standard expression for careful thought.

Can I say mull on?

It is generally considered nonstandard or uncommon compared with mull over.

Does mull always need over?

Usually, though some informal uses omit it before a direct object.

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