Merriam-Webster's Collegiate® Dictionary, 11th Edition
CREASE
I. noun
Etymology: probably alteration of earlier creaste, from Middle English creste crest
Date: 1578
a line, mark, or ridge made by or as if by folding a pliable substance, a specially marked area in various sports, creaseless adjective
II. verb (creased; creasing)
Date: 1588
transitive verb to make a crease in or on ; wrinkle , to wound slightly especially by grazing , intransitive verb to become creased, creaser noun