fit in phrasal verb ( see also ↑ fit )
1 . if someone fits in, they are accepted by the other people in a group:
I never really fitted in at school.
fit in with
I wasn’t sure if she would fit in with my friends.
2 . fit something/somebody ↔ in to manage to do something or see someone, even though you have a lot of other things to do SYN squeeze something/somebody ↔ in :
The doctor said he can fit me in at 4:30.
I wanted to fit in a swim before breakfast.
3 . if something fits in with other things, it is similar to them or goes well with them:
I don’t know quite how this new course will fit in.
fit in with
A new building must fit in with its surroundings.
You can’t expect a baby to fit in with your existing routine.