Definition of go under phrasal verb from the Oxford Advanced American Dictionary

 

go under

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1(of something that floats) to sink below the surface
  2. 2(informal) to become bankrupt (= be unable to pay what you owe) The company will go under unless business improves.
See the Oxford Advanced Learner's Dictionary entry: go under