deathblow

/ˈdɛθbləʊ/

Etymology

From death + blow.

deathblow means A strike or blow that leads to death, especially a coup de grâce. Lexicurio rates it Sui generis — a strength score of 88 out of 100.

deathblow is pronounced /ˈdɛθbləʊ/.

noun

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.”
Something that prevents the completion, or ends the existence, of a project etc.; a fatal setback.“The opening of the bridge dealt a deathblow to the ferry.”