1. Go down below the surface (esp. of water) to become submerged
   "the sun goes under early these days";
   - set, go down
    
2. (of a ship etc.) go under water
   "The raft went under and its occupants drowned";
   - sink, settle, go down
    
3. Be called; go by a certain name
   "She goes under her maiden name again";
   - go by

Derived forms: goes under, gone under, going under, went under

See also: filter

Type of: apply, come down, descend, employ, go down, use, utilise [Brit], utilize

Antonym: float, uprise [archaic, literary]