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."