go under
  沈沒,墮落;有困難,會失敗
  go under
       v 1: go under, "The raft sank and its occupants drowned" [syn: sink,
             settle, go down] [ant: float]
       2: disappear beyond the horizon; "the sun sets early these
          days" [syn: set, go down] [ant: rise]
       3: be called; go by a certain name; "She goes by her maiden
          name again" [syn: go by]