Webster's English Dictionary

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swamp

1. swamp \'swa:mp, 'swo.mp\ \'swa:m-pe-, 'swo.m-\ n [alter. of ME sompe, 
   fr. MD somp morass; akin to MHG sumpf ma] often attrib rsh, Gk somphos 
   spongy 1: wet spongy land saturated and sometimes partially or 
   intermittently cove red with water 2: a tract of swamp  - swampy aj
2. swamp vt 1: to submerge with or as if with water : INUNDATE  2: to open 
   by removing underbrush and debris  : to become submerged