CORRUGATE v.
wrinkles or folds, or alternate ridges and grooves, as by drawing, contraction, pressure, bending, or otherwise; to wrinkle; to purse up; as, to corrugate plates of iron; to corrugate the forehead. Corrugated iron, sheet iron bent into a series of alternate ridges and grooves in parallel lines, giving it greater stiffn…
COURTESY n. 2 definitions
reverence, made by women, consisting of a slight depression or dropping of the body, with bending of the kness. [Written also curtsy.] The lady drops a courtesy in token of obedience, and the ceremony proceeds as usual. Golgsmith.