turn in phrasal verb ( see also ↑ turn )
1 . turn something ↔ in to give something to a person in authority, especially an illegal weapon or something lost or stolen:
The rebels were told to turn in their weapons and ammunition.
turn something ↔ in to
My wallet was turned in to the police two days later.
2 . turn something ↔ in American English to give back something you have borrowed or rented SYN return :
When do the library books have to be turned in?
3 . turn in something to produce a particular profit, result etc:
Bimec turned in net profits of £2.4 million.
Last night the team turned in another dazzling performance.
4 . turn somebody ↔ in to tell the police who or where a criminal is:
Margrove’s wife finally turned him in.
5 . to go to bed:
I think I’ll turn in early tonight.
6 . turn something ↔ in American English to give a piece of work you have done to a teacher, your employer etc SYN hand in British English :
Have you all turned in your homework assignments?