1 plunge, submerse, immerse, inundate, dip, wash, soak, drench, saturate, wet, douse, Colloq dunk:
To cleanse, submerge the garment in a basin of warm water for ten minutes.
2 dive, plunge, go down, descend, sink, sound, plummet:
The order to submerge was given as soon as the planes were spotted.
3 flood, immerse, inundate, swamp, bury, engulf, overwhelm, deluge, drown; conceal, hide, camouflage, obscure, cloak, veil, shroud:
He was quickly submerged under an enormous pile of correspondence.