The Collaborative International Dictionary of English v.0.48:
Swamp \Swamp\, v. t. [imp. & p. p. Swamped; p. pr. & vb. n.
1. To plunge or sink into a swamp.
2. (Naut.) To cause (a boat) to become filled with water; to
capsize or sink by whelming with water.
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.