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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.
兩人一組結(jié)成對;把(一組人)分成幾對
The students paired off to practise their conversational skills.
學生們兩人一組進行會話技巧練習。
After dinner the boys and girls paired off and went to the dance.
會餐后, 男女青年們成對成對地去跳舞。