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turn in

 
part of speech: phrase
definition 1: to give or return something to an official person.
Turn in your exam to the test monitor when you are done.I thought I'd lost my wallet but some nice, honest person turned it in.
definition 2: to go to bed for the night.
I'm really tired this evening; I think I'll turn in early.
definition 3: to report (a person) to the police for having committed a crime.
He might have gotten away with the crime, but his former girlfriend turned him in.