What does "swamp" mean?

Additional senses

1. 2.(Naut.) To cause (a boat) to become filled with water; to capsize or sink by whelming with water.
2. 3.Fig.: To plunge into difficulties and perils; to overwhelm; to ruin; to wreck. The Whig majority of the house of Lords was swamped by the creation of twelve Tory peers. J. R. Green. Having swamped himself in following the ignis fatuus of a theory. Sir W. Hamilton.
3. 4.To sink or stick in a swamp; figuratively, to become involved in insuperable difficulties.
4. 5.To become filled with water, as a boat; to founder; to capsize or sink; figuratively, to be ruined; to be wrecked.