ETYM Cf. LG. krus, German krause, crispness, krausen, kräusen, to crisp, curl, lay on folds; or perh. of Celtic origin; cf. Armor. kriz a wrinkle, crease, kriza to wrinkle, fold, W. crych a wrinkle, crychu to rumple, ripple, crease.
A fold or pleat.

To fold or pleat.