To turn in is to go to bed. (Informal)
Examples of use:
1. It’s late. I think I’ll turn in.
2. You look tired. Why don’t you turn in early?
To turn somebody in is to tell the police that this person has committed a crime, or to tell the police where they can find a criminal they are looking for.
Examples of use:
1. Our neighbour turned his son in to the police when he discovered he had stolen a car.
2. The bank robber was tired of hiding from the police so he turned himself in.
infinitive – turn in
present simple – turn in and turns in
-ing form – turning in
past simple – turned in
past participle – turned in
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