Whelm

1.

(TRANSITIVE) To cover with water or other fluid; to cover by immersion in something that envelops on all sides; to overwhelm; to ingulf.

2.

(FIGURATIVE) (TRANSITIVE) To cover completely, as if with water; to immerse; to overcome; as, to whelm one in sorrows.

3.

(TRANSITIVE) To throw (something) over a thing so as to cover it.