verb (used with object), swapped, swapping.
to exchange, barter, or trade, as one thing for another: He swapped his wrist watch for the radio.
verb (used without object), swapped, swapping.
to make an exchange.
an exchange: He got the radio in a swap.
Also, swop.

1300–50; Middle English swappen to strike, strike hands (in bargaining); cognate with dialectal German schwappen to box (the ears)

swapper, noun
unswapped, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
swap or swop (swɒp)
vb , swaps, swapping, swapped, swops, swopping, swopped
1.  to trade or exchange (something or someone) for another
2.  an exchange
3.  something that is exchanged
4.  finance swap option, Also called: swaption 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)
[C14 (in the sense: to shake hands on a bargain, strike): probably of imitative origin]
swop or swop
[C14 (in the sense: to shake hands on a bargain, strike): probably of imitative origin]
'swapper or swop
'swopper or swop

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, "to strike, strike the hands together," possibly imitative of the sound of hitting. The sense of "exchange, barter, trade" is first recorded 1594, possibly from the practice of slapping hands together as a sign of agreement in bargaining. The noun in this sense is attested from 1625.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
severe weather avoidance procedures
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Since then they have swapped wild rabbits and farm chickens for a diet of
  discarded takeout containers and other garbage food.
The cubs continue to be swapped for months, until they can eat solid foods and
  no longer need to nurse.
Then, one object was swapped for a new toy and rats were scored based on how
  quickly they explored the unfamiliar piece.
Meaning that such solar thermal power plants could be swapped in for fossil
  fuel-burning ones.
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