coupure means A passage cut through the glacis to facilitate sallies by the besieged. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
noun
- A passage cut through the glacis to facilitate sallies by the besieged.“It will be observed here, that the coupure is not cut through the scarp revetment of the face of the bastion, although it is necessary for it to go through the thickness of the parapet”