The Oxford Thesaurus An A-Z Dictionary of Synonyms - swamp n.

1) bog, fen, marsh, quagmire, morass, moor, Chiefly literary slough, Scots and No. Eng. dialect moss, So. US everglade: The draining of swamps destroys the breeding places of mosquitoes. --v. 2) overwhelm, overcome, flood, inundate, submerge, immerse, deluge, overload, overtax, overburden, Colloq snow under: I'm so swamped with work I'm sleeping at the office. 3) scuttle, sink, founder: A huge wave swamped the boat and she sank quickly.