a tract of wet, spongy land, often having a growth of certain types of trees and other vegetation, but unfit for cultivation.
verb (used with object)
to flood or drench with water or the like.
Nautical. to sink or fill (a boat) with water.
to plunge or cause to sink in or as if in a swamp.
to overwhelm, especially to overwhelm with an excess of something: He swamped us with work.
to render helpless.
to remove trees and underbrush from (a specific area), especially to make or cleave a trail (often followed by out ).
to trim (felled trees) into logs, as at a logging camp or sawmill.
verb (used without object)
to fill with water and sink, as a boat.
to sink or be stuck in a swamp or something likened to a swamp.
to be plunged into or overwhelmed with something, especially something that keeps one busy, worried, etc.

1615–25; < Dutch zwamp creek, fen; akin to sump and to Middle Low German swamp, Old Norse svǫppr sponge

swampish, adjective
underswamp, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
swamp (swɒmp)
1.  a.  Compare marsh permanently waterlogged ground that is usually overgrown and sometimes partly forested
 b.  (as modifier): swamp fever
2.  to drench or submerge or be drenched or submerged
3.  nautical to cause (a boat) to sink or fill with water or (of a boat) to sink or fill with water
4.  to overburden or overwhelm or be overburdened or overwhelmed, as by excess work or great numbers: we have been swamped with applications
5.  to sink or stick or cause to sink or stick in or as if in a swamp
6.  (tr) to render helpless
[C17: probably from Middle Dutch somp; compare Middle High German sumpf, Old Norse svöppr sponge, Greek somphos spongy]

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

1624 (first used by Capt. John Smith, in reference to Virginia), perhaps a dial. survival from an O.E. cognate of O.N. svoppr "sponge, fungus," from P.Gmc. *swampuz; but traditionally connected with M.E. sompe "morass, swamp," probably from M.Du. somp or M.L.G. sump "swamp." Related to O.N. svöppr
"sponge." The verb sense of "overwhelm, sink (as if in a swamp)" is first recorded 1772; fig. sense is from 1818. Swamp Yankee "rural, rustic New Englander" is attested from 1941.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
swamp   (swŏmp)  Pronunciation Key 
An area of low-lying wet or seasonally flooded land, often having trees and dense shrubs or thickets.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Most of the metropolitan area lies below sea level on drained swamp land.
There's a moment in every swamp movie when you know things are not going to go
Suppose, for instance, that a department has three unproductive professors in
  the field of swamp maintenance.
The tide of self-published books threatens to swamp their products.
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