expression, godan verb (-u)
get along well with; be compatible with
Describes a natural, easy compatibility in personality or temperament. Often used in the negative form 性が合わない to indicate a clash of personalities.
彼とは性が合うので、一緒にいて楽だ。
I get along well with him, so it's easy to be together.
どうもあの人と
I just don't get along with that person.