"Coup de main" is a French term that refers to a surprise attack or an unexpected move that can lead to a quick victory. The antonyms for this phrase would include terms like retreat, surrender, loss, and defeat. These words signify an opposite action to that of a "coup de main," where one is giving up or losing rather than advancing. Other antonyms for this phrase could be peace, reconciliation, negotiation, compromise, or truce, as these words imply a peaceful resolution rather than a violent attack. It is crucial to understand antonyms to a word or phrase as it helps in enhancing our vocabulary and communication skills.