1911 Encyclopædia Britannica/Cuff

CUFF. (1) (Of uncertain origin), the lower edge of a sleeve turned back to show an ornamental border, or with an addition of lace or trimming; now used chiefly of the stiff bands of linen worn under the coat-sleeve either loose or attached to the shirt. (2) Also uncertain in origin, but with no connexion, probably, with (1), a blow with the hand either open or closed, as opposed to the use of weapons.