set in

phrasal verb·1 sense·particle in

Usefulness

Meanings

1

Begin and become established

Beginninguncommon

Why “in”? In marks the start of an action or change. It can also mean slowly using something new until it feels comfortable.

Winter has really set in.
The cold winter weather has fully begun.
Panic set in after the alarm.
People began to panic after the alarm, and the feeling grew.

Don't confuse with

set inset on

Set in means begin and become established. Set on means attack someone suddenly.

Test yourself

Winter has really set in. What does it mean?

Nearby in the meaning map

Sink In connects verbs by particle pattern, contrast pairs, and shared base verbs.

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