traded or exchanged one thing for another, or switched places or positions.
From Middle English 'swappen' meaning 'to strike' or 'to hit,' possibly onomatopoetic. The meaning evolved to 'exchange' through the sense of making a deal that 'strikes' quickly.
The practice of swapping has ancient roots—bartering was humanity's first economic system before money existed, and in modern times, 'swap meets' became popular in the 1970s as communities discovered organized trading was more efficient than random exchanges.
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