Synonyms of 'swamp'
bogDictionary, marsh, quagmire
Much of the land is desert or swamp.
We walked steadily across moor and bog.
a recently reclaimed saltwater marsh
Overnight rain had turned the grass airstrip into a quagmire.
moss (Scottish , Northern England , dialect)
Peat is growing in the fen.
Many of those killed were buried in the mire.
a morass of gooey mud
pakihi (New Zealand)
1 floodDictionary, engulf, submerge
The Ventura river burst its banks, swamping a mobile home park.
2 overloadDictionary, overwhelm, inundate
We swamp them with praise, make them think that they are important.
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If soldiers besiege a place, they surround it and wait for the people in it to stop fighting or resisting.
The main part of the army moved to besiege the town.
If rain deluges a place, it falls very heavily there, sometimes causing floods.
Torrential rain deluged the capital.
Thesaurus for swamp from the Collins English Thesaurus
A swamp is an area of very wet land with wild plants growing in it.