Verb go under has 3 senses
  1. sink, settle, go down, go under - go under, "The raft sank and its occupants drowned"
    --1 is one way to descend, fall, go down, come down
    Sample sentences:
    Something ----s
    Somebody ----s
  2. set, go down, go under - disappear beyond the horizon; "the sun sets early these days"
    --2 is one way to descend, fall, go down, come down
    Sample sentence:
    The moon will soon go under
  3. go by, go under - be called; go by a certain name; "She goes by her maiden name again"
    Sample sentences:
    Somebody ----s something
    Something ----s something
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