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swap

[swop]
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verb (used with object), swapped, swap·ping.
  1. to exchange, barter, or trade, as one thing for another: He swapped his wrist watch for the radio.
  2. to substitute (one thing) for another (sometimes followed by in): Swap in red wine for white, since powerful nutrients are in the red grape's skin.
  3. to replace (one thing) with another (sometimes followed by out): To cut down on fat, swap cream for milk.
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verb (used without object), swapped, swap·ping.
  1. to make an exchange.
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noun
  1. an exchange: He got the radio in a swap.
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Also especially British, swop.

Origin of swap

1300–50; Middle English swappen “to strike, strike hands (in bargaining)”; cognate with dialectal German schwappen “to clap, box (the ears)”
Related formsswap·per, nounun·swapped, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for swapper

swap

swop

verb swaps, swapping, swapped, swops, swopping or swopped
  1. to trade or exchange (something or someone) for another
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noun
  1. an exchange
  2. something that is exchanged
  3. Also called: swap option, swaption finance a contract in which the parties to it exchange liabilities on outstanding debts, often exchanging fixed interest-rate for floating-rate debts (debt swap), either as a means of managing debt or in trading (swap trading)
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Derived Formsswapper or swopper, noun

Word Origin

C14 (in the sense: to shake hands on a bargain, strike): probably of imitative origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for swapper

swap

v.

c.1300, "to strike, strike the hands together," possibly imitative of the sound of hitting. The sense of "exchange, barter, trade" is first recorded 1590s, possibly from the practice of slapping hands together as a sign of agreement in bargaining. Related: Swapped; swapping. The noun in this sense is attested from 1620s.

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Online Etymology Dictionary, © 2010 Douglas Harper