כהי, כָּהָה (b. h.; cmp. כָּוָה) 1) to be dim (of sight, light). Gen. R. s. 65 כָּהוּ עיניו his eyes grew dim. Ib. שיִכְהוּ עיניו that his eye-sight shall fail. Kidd. 24ᵇ … הכהו וכָהֲתָה if the master struck him on his eye, and it grew dim; a. fr.—Part. pass. כָּהוּי, f. כָּהוּיָה. Ib. הרי שהיתה עינו כ׳ וכ׳ if his eye-sight was dim, and he (the master) made him perfectly blind. —2) (of color) to be dull, v. כֵּהֶה. [Tosef. Erub. XI (VIII), 8; Tanḥ. Noah 9, v. כָּחַח.]
Pi. - כִּיהָה, כִּהָה to grow duller, to be shaded. Sifra Thazr., Neg., Par. 2, ch. II אם העז וכ׳ if the spot grew brighter and grew duller again; a. fr.—2) to declare doubtful. Neg. IV, 11 ר׳ י׳ כ׳, v. כֵּהֶה.
Hif. - הִכְהָה 1) same. Y. Shebu. I, 32ᵈ, v. כֵּהֶה. Neg. XI, 5 ה׳ בתחלה if the suspicious spot grew fainter at once (before the ordered isolation was begun); ה׳ בראשון if it grew faint in the first week; Tosef. ib. V, 6 quot. in R. S. to Neg. l. c. (ed. Zuck. כהה כתחלה, oth. ed. only כתחלה, corr. acc.); a. fr. —2) to make dim. Gen. R. l. c. הריני מַכְהֶה וכ׳ I will make his eye-sight dim. Yalk. Ruth 601 ייסורין מַכְהִין וכ׳ … sufferings of poverty dim men’s eyes. Pesik. R. s. 14 מכהה גלגל חמה dimmed (outshone) the sun in brightness; Pesik. Parah, p. 37ᵃ שיַכְהֶה; a. e.