Definition of swamp noun from the Oxford Advanced Learner's Dictionary

 

swamp

 noun
noun
BrE BrE//swɒmp//
 
; NAmE NAmE//swɑːmp//
 
 
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[countable, uncountable] an area of ground that is very wet or covered with water and in which plants, trees, etc. are growing synonym marsh tropical swamps The country contains around 700 square km of swamp. Word Origin early 17th cent.: probably ultimately from a Germanic base meaning ‘sponge’ or ‘fungus’.
See the Oxford Advanced American Dictionary entry: swamp