doubling (dubling)

[Verbal n. of double, v.] 1. Something doubled or folded over; a fold; a plait; specifically ( naut. ), the doubled edge or skirt of a sail.-2. That the addition of which makes double. Specifically - (a) In her., the lining of a mantle or mantling. (b) In slating, the double course of slates at the eaves of a house: sometimes applied to the eaves-board. (c) In music, the addition to a tone of its upper or lower octave. 3. pl. Naut., that part of a mast included between the trestletrees and the cap.-4. The second distillation of wine. - 5. The act of marching at the double-quick. [Rare.]-6. In bot., same as chorisis. - Doubling of the bow. See bows.