fill in phrasal verb ( see also ↑ fill )
1 . DOCUMENT fill something ↔ in to write all the necessary information on an official document, form etc:
Don’t forget to fill in your boarding cards.
2 . TELL SOMEBODY NEWS fill somebody ↔ in to tell someone about recent events, especially because they have been away from a place
fill somebody ↔ in on
I think you’d better fill me in on what’s been happening.
3 . CRACK/HOLE fill something ↔ in to put a substance into a hole, crack etc so it is completely full and level
4 . fill in time to spend time doing something unimportant because you are waiting for something to happen:
She flipped through a magazine to fill in the time.
5 . SPACE fill something ↔ in to paint or draw over the space inside a shape
6 . DO SB’S JOB to do someone’s job because they are not there
fill in for
I’m filling in for Joe for a few days.