Coup de Grace
A "Coup de Grâce" is a French term that translates to "blow of mercy." It refers to a final, decisive action that brings an end to a situation, often in a dramatic or conclusive manner. In military contexts, it can describe a finishing blow delivered to a wounded opponent to ensure they do not recover.
In broader usage, the term can apply to any act that decisively concludes a series of events, such as a final argument in a debate or a critical decision in a business context. It signifies a moment that decisively shifts the outcome, often with a sense of finality.