pair up phrasal verb (see also pair)

1. British English to become friends and start to have a relationship:
We learned later that he and Tanya had paired up.

2. to work together to do something or to put two people together to do something:
They first paired up in the screen adaptation of ‘Grease’.
pair somebody ↔ up
They have paired up writers and artists, and commissioned linked works.

3. if animals pair up, they come together in order to breed

[TahlilGaran] Dictionary of Contemporary English ▲

pair up
v.
1. To make a pair of; match.
When she finished the mending, she paired up the socks.
2. To form a pair; to be or become one of a pair.
Not all the socks would pair up.
Joe paired up with Charlie to work on the lesson.

[TahlilGaran] English Idioms Dictionary ▲