hit it off
Meaning: If you meet someone for the first time and the two of you hit it off, you get along really well and have a great time together.
- Brad and Angelina hit it off the first time they met, and they've been together ever since.
- I met a guy at Alan's wedding and we hit it off straight away. We talked and laughed together all night.
I was at the pub last night and I met this girl and we really hit it off so