1.
If you manage to fit a person or task in, you manage to find time to deal with them.
We work long hours both outside and inside the home and we rush around trying to fit everything in...
I find that I just can’t ~ regular domestic work.
PHRASAL VERB: V n P, V P n (not pron)
2.
If you ~ as part of a group, you seem to belong there because you are similar to the other people in it.
She was great with the children and fitted in beautifully.
PHRASAL VERB: V P
3.
If you say that someone or something fits in, you understand how they form part of a particular situation or system.
He knew where I fitted in and what he had to do to get the best out of me...
This fits in with what you’ve told me.
PHRASAL VERB: V P, V P with n