noun

a line or ridge produced on paper or cloth by folding, pressing, or crushing.

khaki trousers with knife-edge creases

fold,groove,ridge,furrow,line,ruck,pleat,tuck,corrugation,ruckle

verb

make a crease in (cloth or paper).

he sank into the chair, careful not to crease his dinner jacket

crumple,wrinkle,crinkle,scrunch up,rumple,line,pucker,crimp,ruck up,gather,furrow,ruckle,press,iron,put a crease in,fold,corrugate,pleat,tuck