Deathblow

//ˈdɛθbləʊ// noun

Definitions

Noun
  1. 1
    A strike or blow that leads to death, especially a coup de grâce.

    "He was also there at that fight when Hygelac folded under his deathblow."

  2. 2
    the blow that kills (usually mercifully) wordnet
  3. 3
    Something that prevents the completion, or ends the existence, of a project etc.; a fatal setback. figuratively

    "The opening of the bridge dealt a deathblow to the ferry."

Etymology

From death + blow.

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