*כְּבַב to be thick, hollow, arched.—Denom. כַּבָּא, כּוּבָּא.
Pa. - כַּבֵּיב (denom. of כּוּבָּא, v. Fl. to Levy Targ. Dict. I, 427ᵇ) to burn thorns, to char. Erub. 29ᵇ ונִיכַּבְּבֵיה and let him char it (the meat; Rashi: let him roast it over the charred thorns; v. כִּיבָּא).