What is the meaning of "to hand in" idiom?
Student 1: Did you finish that essay for English class?
Student 2: Not yet. How about you?
Student 1: I handed in my essay this morning.
Student 2: Too bad. I wanted to take a look at it.
to give something to a person in authority
Coworker 1: Have you given the boss your application for promotion yet?
Coworker 2: No, I haven't handed the form in yet.
Coworker 1: Do you want me to go over it for you?
Coworker 2: That would be great, thanks.
Handing in your application form for university on time is important.