sub·merse 
(səb-mûrs)
(səb-mûrs)tr.v. sub·mersed, sub·mers·ing, sub·mers·es
To submerge.
[Probably back-formation from submersion, act of submerging, from Late Latin submersiō, submersiōn-, from Latin submersus, past participle of submergere, to submerge; see SUBMERGE.]
sub·mersion (-mûrzhən, -shən) n.