catch a falling knife

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catch a falling knife (third-person singular simple present catches a falling knife, present participle catching a falling knife, simple past and past participle caught a falling knife)

  1. (trading) To buy an instrument whose price is falling rapidly.
    Buying that stock now would be catching a falling knife. Wait until you see capitulation.
  2. (trading) To buy an instrument with the unconfirmed assumption that price will reverse.