(1):

(p. pr. & vb. n.) of Double

(2):

(n.) The act of one that doubles; a making double; reduplication; also, that which is doubled.

(3):

(n.) The lining of the mantle borne about the shield or escutcheon.

(4):

(n.) A turning and winding; as, the doubling of a hunted hare; shift; trick; artifice.

(5):

(n.) The process of redistilling spirits, to improve the strength and flavor.