submerge

Short definition from Wiktionary

Verb

1. 1
   To sink out of sight.
2. 2
   To put into a liquid; to immerse; to plunge into and keep in.
3. 3
   To be below the surface of the sea, a lake, river, etc.
4. 4
   To engulf or overwhelm.
5. 5
   To drown or suppress.