hand (something) in
Definition: to give a piece of work to someone (for example, a teacher) so that it can be checked or corrected.
(This phrasal verb has more than one meaning)
E.g.1: Here is your homework. Make sure you hand it in by Friday.
E.g.2: After we’ve handed in our assignments, shall we go to the pub to celebrate?
This phrasal verb can be separated (E.g.1)