כֹּחַ, v. יָכַח) firmness, strength, power. Hor. 9ᵃ בנוי בכ׳ וכ׳ in beauty, in physical strength, &c. Ḥag. 12ᵃ. Snh. 96ᵃ תשש כֹּחוֹ his strength failed him. Ber. 63ᵃ כל … אין בו כח וכ׳ he who is careless about the study of the Law, will have no strength to endure on the day of trouble; a. v. fr.—Bets. 2ᵇ, a. fr. (mixed diction) להוריעך … כֹּחָן to show the power of …, i.e. how far-reaching are the consequences of the opinion of … Ib., a. fr. כח דהיתרא עדיף showing the power of the more lenient opinion is preferred (as an evidence of courage of conviction, while the more rigid opinion may be the outcome of doubt).—כח כֹּחוֹ indirect action, opp. כֹּחוֹ direct action. B. Kam. 18ᵃ שאני … בין נזק כחו לכח כחו S. distinguishes between direct and indirect injury. Ib. 19ᵃ. Macc. 8ᵃ.—Ab. Zar. 60ᵃ כ׳ כ׳ pressing wine by turning a wheel. B. Kam. 10ᵇ, v. לַאו.—Snh. 77ᵇ כ׳ ראשון direct agency, כ׳ שני indirect agency.—Shebu. 48ᵃ, a. fr. יפה כ׳, v. יָפֶה.—Ohol. XVIII, 6 שכֹּחָן יפה who (which) can endure pressure without shaking, opp. כחן רע; Zab. III, 1; B. Mets. 105ᵇ; a. e.—Gen. R. s. 98, v. לִיבְדְּקוֹס. Y. Pes. I, 27ᶜ bot. ל"ת שבא מכח עשה a prohibition derived from a positive law, v. לַאו; a. fr.—Trnsf. coition. Yeb. 34ᵃ