כָּחַח, (onomatop., cmp. חָכַךְ II) [to scratch,] to cough, to bring up mucus. Erub. 99ᵃ כָּח בפני רבו (not כיח, v. Rabb. D. S. a. l. note 16) he who coughs in sight of his teacher, expl. ib. כח ורק (not כיח) when he coughs and spits out. Tosef. ib. XI (VIII), 8 הכּוֹחֶה וכ׳ (fr. כָּחַהּ) he who coughs (brings mucus up in his mouth) in the street. Tanḥ. Noah 9 גונח וכוֹהֶה דם coughing and spitting blood; (Tanḥ. ed. Bub. ib. 14 גונח מלבו), v. גָּנַח.