pair (sb) off

If a group of people pair off, they divide into pairs in order to do something, and if you pair them off, you divide them into pairs.

两人一组结成对;把(一组人)分成几对

The students paired off to practise their conversational skills.

学生们两人一组进行会话技巧练习。

After dinner the boys and girls paired off and went to the dance.

会餐后， 男女青年们成对成对地去跳舞。