Turn in : English Phrasal verb : Online English Lessons

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