turn something in

Từ điển Oxford Advanced Learner 8th

ˌturn sthˈin derived
1. to give back sth that you no longer need
•You must turn in your pass when you leave the building.
2. (especially NAmE)to give sth to sb in authority
•They turned in a petition with 80 000 signatures.
•I haven't even turned in Monday's work yet.
3. to achieve a score, performance, profit, etc
•The champion turned in a superb performance to retain her title.
Main entry: ↑turn_derived