to live, work, etc. in an easy and natural way with somebody/something
جور شدن, هماهنگ شدن, سازگاری داشتن, هماهنگی داشتن, خود را وفق دادن
He's never done this type of work before; I'm not sure how he'll fit in with the other people.
Do these plans fit in with your arrangements?