embrasure

1. (architecture, military) Any of the indentations between the merlons of a battlement; an opening in a wall or parapet through which ordnance can be fired.Examples: "Near-synonym: crenel (sometimes hyponymous technically)"; "But there were less casualties than might have been expected, and the barricade rose steadily, a wall of concrete two feet thick, with embrasures for two machine-guns and a small field gun."; "The walls are slitted with embrasures through which bowmen could fire, indicating that the belfry also served as a stronghold during border skirmishes."

2. (figurative) Any small protected space.Examples: "She had a special seat there, a little embrasure between two upright slabs of sandstone, which was sheltered and private."figuratively

3. (obsolete) An embrace.Examples: "And suddenly; where injury of chance / Puts back leave-taking, justles roughly by / All time of pause, rudely beguiles our lips / Of all rejoindure, forcibly prevents / Our lock'd embrasures, strangles our dear vows / Even in the birth of our own labouring breath:"obsolete