WordNet (r) 3.0 (2006):
go under v 1: go under, "The raft sank and its occupants drowned" [syn: sink, settle, go down, go under] [ant: float, swim] 2: disappear beyond the horizon; "the sun sets early these days" [syn: set, go down, go under] [ant: ascend, come up, rise, uprise] 3: be called; go by a certain name; "She goes by her maiden name again" [syn: go by, go under]