Definition of 'go under'

Verb

1. go under, "The raft sank and its occupants drowned"
      Synonyms: sink settle go down
      Antonyms: float swim
2. disappear beyond the horizon; "the sun sets early these days"
      Synonyms: set go down
      Antonyms: rise come up uprise ascend
3. be called; go by a certain name; "She goes by her maiden name again"
      Synonyms: go by

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