Definition of coup de grâce noun from the Oxford Advanced American Dictionary

     

    coup de grâce

     noun
    noun
    NAmE//ˌku də ˈɡrɑs//
     
    [singular](from French)(formal)
     
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  1. 1an action or event that finally ends something that has been getting weaker or worse My disastrous exam results dealt the coup de grâce to my college career.
  2. 2a hit or shot that finally kills a person or an animal, especially to put an end to their suffering synonym death blow
See the Oxford Advanced Learner's Dictionary entry: coup de grâce