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we shared a room at university and hit it off from the start

They didn't hit it off in beginning. They got off on the wrong foot but they are good friends now.

Mark and Sarah really hit it off at the party.

It is difficult nowadays to find a person with which you can easily hit it off. Nevertheless if you don't try you will never find out if it is true.

I really hit it off with him.

if two people hit it off when they meet for the first time, they like each other

I knew you and Mike would hit it off straight away.

We hit it off and started playing a lot together.

We had similar ideas about the show, and the two of us hit it off right away