pair off
pair off {v.}
1. To make a pair of; put two together; associate; match.
Mrs. Smith paired off her guests by age and tastes.
2. To belong to a pair; become one of a pair.
Jane paired off with Alice in a tennis doubles match.
3. To divide or join into pairs.
Later in the day the picnic crowd paired off for walks and boat rides.
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Source: A Dictionary of American Idioms
