a special section of some law enforcement agencies trained and equipped to deal with especially dangerous or violent situations, as when hostages are being held (often used attributively): a SWAT team.
Also, S.W.A.T.

S(pecial) W(eapons) a(nd) T(actics)

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
swat1 (swɒt)
vb , swats, swatting, swatted
1.  to strike or hit sharply: to swat a fly
2.  another word (esp Brit) for swatter
3.  a sharp or violent blow
[C17: northern English dialect and US variant of squat]

swat2 (swɒt)
vb, —n , swats, swatting, swatted
a variant of swot

Swat (swɒt)
1.  a former princely state of NW India: passed to Pakistan in 1947
2.  a river in Pakistan, rising in the north and flowing south to the Kabul River north of Peshawar. Length: about 640 km (400 miles)

SWAT (swɒt)
n acronym for
Special Weapons and Tactics: a military-like unit within the US police force, trained to deal with specially dangerous situations, such as hostage-taking and riots

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

1796, Amer.Eng. and northern England dialect word, possibly an alteration of M.E. swap "to strike, smite" (see swap), ultimately of imitative origin. The noun is recorded from 1800. Swatter "instrument for swatting flies" is recorded from 1917.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
  1. special weapons and tactics

  2. special weapons attack team

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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