vbl. sb. [f. TREBLE v. + -ING1.] The action of the verb TREBLE.
1. Increasing threefold; multiplication by three.
1591. Percivall, Sp. Dict., Trasdobladura, trebling, triplicatio.
1694. Phil. Trans., XVIII. 70. The doubling, trebling, quadrupling, &c. of Rations is performed by squaring, cubing, biquadrating, &c. of the terms.
2. Naut. See quots.
1856. Kane, Arct. Expl., I. xxxi. 423. The outside trebling or oak sheathing.
1867. Smyth, Sailor’s Word-bk., Trebling, planking thrice around a whaler’s bows in order the more effectually to withstand the pressure of the ice.
