n. A piece of wet, spongy land; low ground saturated with water; soft, wet ground which may have a growth of certain kinds of trees, but is unfit for agricultural or pastoral purposes.n. In coal-mining, a local depression in a coal-bed, in which water may collect.n. A shallow lake.To plunge, whelm, or sink in a swamp, or as in a swamp.To plunge into inextricable difficulties; overwhelm; ruin; hence, to outbalance; exceed largely in numbers.Nautical, to overset, sink, or cause to become filled, as a boat, in water; whelm.To cut out (a road) into a forest. See swamper.To sink or stick in a swamp; hence, to be plunged in inextricable difficulties.To become filled with water and sink, as a boat; founder; hence, to be ruined; be wrecked.Thin; slender; lean.In lumbering, to clear (the ground) of under-brush, fallen trees, and other obstructions preparatory to constructing a logging-road or opening out a gutter-road.