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.
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.