two things that go together or are similar, like a pair of shoes or two people working as a team.
From Latin 'paria' meaning 'equal' or 'matched things.' It entered English in the 1200s and refers to things matched together or suited to go with each other.
The word 'pair' comes from the Latin root meaning 'equal'—so when things 'pair,' they're supposed to be equal matches, which is why we say things are 'paired up' when they're balanced!
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