Deathblow

(n.) A mortal or crushing blow; a stroke or event which kills or destroys.

Thesaurus Entries

KO, Waterloo, bane, beating, clincher, collapse, conquering, conquest, crash, crusher, death, death knell, death stroke, debacle, defeat, destruction, doom, downfall, drubbing, early death, early grave, end, end-all, ender, failure, fall, fate, final stroke, finisher, finishing stroke, hiding, kayo, kayo punch, knockout, knockout blow, lambasting, last dab, lathering, lethal blow, licking, mastery, overcoming, overthrow, overturn, quietus, ruin, settler, smash, sockdolager, stopper, stroke of death, subdual, subduing, subjugation, sudden death, thrashing, trimming, trouncing, undoing, untimely end, vanquishment, whipping