Corrugate

v. t. [imp. & p. p. CORRUGATED; p. pr. & vb. n. CORRUGATING.] [Lat. corrugatus, p. p. of corrugare, from con and rugare, to wrinkle, from ruga, wrinkle.] To form or shape into wrinkles or folds, as by drawing, contraction, pressure, or otherwise; as, to corrugate plates of iron; to corrugate the forehead.