hit it off (third-person singular simple present hits it off, present participle hitting it off, simple past and past participle hit it off)
- (informal) To develop an amicable relationship (with), especially in a sudden manner during an initial encounter.
- I really hit it off with Jack, and hired him without needing an interview.
- Those two are really hitting it off. I wouldn't be surprised if they started dating soon.
develop an amicable relationship