Definition of "Crease" :

noun: a Malayan dagger with a wavy blade

noun: a slight depression or fold in the smoothness of a surface

noun: an angular or rounded shape made by folding

"A crease in his trousers."

verb: become wrinkled or crumpled or creased

verb: scrape gently

verb: make wrinkled or creased

verb: make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; crisp' is archaic

"Crease the paper like this to make a crane."