Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: sump 'swamp' (15-20 centuries); SUMP

swamp

1 noun
     
Related topics: Nature, Geography
swamp1 [uncountable and countable]
DNSG land that is always very wet or covered with a layer of water
—swampy adjective:
the soft, swampy ground
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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