SUBMERGE

[verb] - to go below the surface of the sea or a river or lakeThe submarine submerged when enemy planes were sighted. [I]She was taken to hospital after being submerged in an icy river for 45 minutes. [T]To submerge something also means to cover or hide it.They decided to submerge their different interests and unite in pursuit of a common goal.If you submerge yourself in an activity, you put all your effort into doing that activity.She is an actress who always tries to submerge herself completely in a role.