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.
Moby Thesaurus II by Grady Ward, 1.0:
59 Moby Thesaurus words for "swamped":
afloat, aground, at flood, awash, bathed, castaway, deluged,
dipped, drenched, dribbling, dripping, dripping wet, drowned,
engulfed, flooded, foundered, grounded, high and dry, immersed,
in spate, inflood, inundated, macerated, marooned, on the rocks,
oozing, overflowed, overwhelmed, permeated, saturated, seeping,
set fast, shipwrecked, soaked, soaking, soaking wet, soaky, sodden,
soggy, sopping, sopping wet, soppy, soused, steeped, stranded,
stuck, stuck fast, submerged, submersed, swept, washed,
water-washed, waterlogged, watersoaked, weeping, weltering,
whelmed, wrecked, wringing wet