A relay race or system of passing a baton between runners; also a messenger service or system of relay communication.
From French 'estafette' or directly from Italian 'staffetta,' derived from 'staffa' (stirrup). The connection to 'stirrup' reflects the original meaning of a mounted messenger who would hand off messages between posts.
The word 'estafet' originally meant mounted couriers who'd gallop between posts handing off messages—the Olympics relay race is literally named after a medieval communication system!
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