Jastrow: כֶּסֶל

כֶּסֶל c. (b. h.; 1) [incision,] groin, loin.—Bekh. 40ᵃ, v. כָּסוּל. Yalk. Gen. 133 (quot. fr. Midr. Vayisu) בכסא ימנית (corr. acc.) in the right loin.—Pl. כְּסָלִים, כְּסָלִין. Tosef. Bekh. IV, 10 [read:] כל שכְּסָלָיו יוצאין a kasul is one whose loins protrude. Sabb. 31ᵇ וישׁ להם חלב על הכ׳ Ar. (ed. כִּסְלָם) and yet have fat on the groins (are careless).—Trnsf. 2) (cmp. טפש) laziness, inactivity; 3) trust; 4) thought. Yalk. Num. 742; Yalk. Ps. 819 quot. fr. Y’lamd. (v. Ar. s. v. כסל) כִּסְלָם … מחשבתם וכ׳ kislam (Ps. LXXVIII, 7) means their thought, as we read (Lev. III, 4, cmp. כִּלְיָה) ‘that which is by the loins’; (oth. opin.) טיפשותן it means their inactivity, as it is said (Koh. IV, 5) &c.; (oth. opin.) בטחונן their trust as we read (Job XXXI, 24) &c.