keep in

phrasal verb·1 sense·particle in

Usefulness

Meanings

1

Force someone to stay indoors as punishment

Why “in”? A person or thing enters or remains within a space, limit, activity, or feeling.

The teacher kept him in at break.
The teacher forced him to stay indoors at break as punishment.
Dad kept us in for breaking the window.
Dad forced us to stay indoors as punishment for breaking the window.

Don't confuse with

keep inkeep out

Keep in means force someone to stay indoors as punishment. Keep out means prevent someone or something from entering.

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The teacher kept him in at break. What does it mean?

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