(1):

(n.) The act of overwhelming.

(2):

(v. t.) To cover over completely, as by a great wave; to overflow and bury beneath; to ingulf; hence, figuratively, to immerse and bear down; to overpower; to crush; to bury; to oppress, etc., overpoweringly.

(3):

(v. t.) To project or impend over threateningly.

(4):

(v. t.) To cause to surround, to cover.