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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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Computing Dictionary

swap definition

operating system
To move a program from fast-access memory to a slow-access memory ("swap out"), or vice versa ("swap in"). The term often refers specifically to the use of a hard disk (or a swap file) as virtual memory or "swap space".
When a program is to be executed, possibly as determined by a scheduler, it is swapped into core for processing; when it can no longer continue executing for some reason, or the scheduler decides its time slice has expired, it is swapped out again.
This contrasts with "paging" systems in which only parts of a program's memory is transfered.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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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
Court ruled that those swap agreements were not legal because the council was
  not authorized to trade speculatively.
The next great development in risk management was the swap.
When in need, you probably swap something you have-including money-for
  something you don't.
Bacteria swap genes with their neighbors more frequently than researchers have
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