fit in

US /fɪt ɪn/
UK /fɪt ɪn/
"fit in" picture
1.

to be accepted by a group of people

:
It took her a while to fit in with her new classmates.
He always tries to fit in, even if it means changing himself.
2.

to be the right size or shape for a particular space

:
Will this large sofa fit in the living room?
The new shelves don't quite fit in the alcove.