Creasing \Creas"ing\ (kr[=e]s"[i^]ng), n. (Arch.) A layer of tiles forming a corona for a wall. --Knight. Crease \Crease\, v. t. [imp. & p. p. {Creased} (kr?st); p. pr. & vb. n. {Creasing}.] To make a crease or mark in, as by folding or doubling. Creased, like dog's ears in a folio. --Gray.