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Verb: take a dive
  1. Pretend to be knocked out, as of a boxer
    "Some fans accused the fighter of taking a dive in the championship match"
     
  2. [informal] Decline suddenly or dramatically
    "The stock market took a dive after the announcement"

Derived forms: taking a dive, takes a dive, took a dive, taken a dive

Type of: affect, dissemble, feign, pretend, sham