a space between two lines or surfaces that mean

shape formed by two lines meeting at a point

a curve or turn

curve

a knot made with a loop or loops; a shoelace, ribbon etc tied in this way

bend from waist

a part (of a card, paper etc) that is folded

double thickness

bow

bow

a front part of a coat or jacket that is folded back and forms part of the collar

fold

fold

fold

irregular fold or crease (especially in cloth)

fold

(to cause something) to move round a point; (to cause something) to change in nature, quality, condition, shape etc; to reach and pass (the age, time etc mentioned)

revolution, curving