turn in

turn in

to go to your bed in order to sleep. I'm getting sleepy — I think I'll turn in.

See also: turn

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turn in someone

to take or report someone to the police or other authority. I would feel very nervous about turning in my neighbors to the police. He learned that the police were looking for him and turned himself in.

See also: turn

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turn in something

to give or return something to someone in authority. We have another week to turn in the report. He found a stack of twenty-dollar bills and he doesn't want to turn it in.

See also: turn