hand something in to somebody

Từ điển Oxford Advanced Learner 8th

ˌhand sthˈin (to sb) derived
(BrE also ˌgive sth ˈin (to sb))to give sth to a person in authority, especially a piece of work or sth that is lost
• You must all hand in your projects by the end of next week.
• I handed the watch in to the police.
•to hand in your notice/resignation (= formally tell your employer that you want to stop working for them)
Main entry: ↑hand_derived