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thin out

B2 neutral separable both
In simple words

When things become fewer, or when you spread something out so there is less of it in one place.

Literal meaning: To become or make thinner outward.

Meanings

1 B2 neutral

(Intransitive) Of a crowd, group, or density: to become smaller or less concentrated.

"After midnight, the crowd at the festival began to thin out."

Grammar: inseparable
2 B2 neutral

(Transitive) In gardening: to remove some plants or seedlings so that others have more space to grow.

"You should thin out the seedlings once they reach about five centimetres tall."

Grammar: separable
3 B2 neutral

(Transitive) To dilute or reduce the thickness of a liquid or substance.

"Add a little water to thin out the paint before applying it."

Grammar: separable
Usage notes

Used both intransitively (the crowd thinned out) and transitively (thin out the seedlings / thin out a sauce). Common in gardening, cooking, and crowd/traffic contexts.

Commonly used with

crowd traffic forest hair seedlings sauce

Forms

Base
thin out
I/you/we/they
3rd person
thins out
he/she/it
Past simple
thined out
yesterday
Past participle
thined out
have + pp
-ing form
thining out
continuous

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