go under

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go under (third-person singular simple present goes under, present participle going under, simple past went under, past participle gone under)

  1. to descend into a body of water
    the boat was too heavy and went under.
  2. (idiomatic) to be named, to call oneself
    He goes under the name of Mr X to remain anonymous.
  3. (idiomatic) to go bankrupt, to collapse
    In the crisis, the company was forced to reduce its costs in order to avoid going under.
  4. to enter a state of hypnosis