כָּשֵׁר I (b. h.; cmp. גשר) [to be well-joined, (cmp. יָפֶה, אֲרִיךְ II),] to be proper, fit, right; to turn out well, to succeed. Y. Ḥall. I, 57ᵇ top החטים שׁכָּשְׁרוּ לשאר וכ׳ wheats which are fit for all other meat offerings; ib. 57ᶜ; Sifra Vayikra, N’dabah, ch. XIV, Par. 13; a. fr.—V. כָּשֵׁר II.
Hif. - הִכְשִׁיר 1) (ritual, v. (ritual, v. כָּשֵׁר II) to pronounce kasher, to permit. Ḥull. III, 2 ר׳ … מַכְשִׁיר R. pronounces it fit to be eaten, opp. פוסל; a. v. fr. —2) to make fit, to prepare. Ab. VI, 1 מַכְשַׁרְתּוֹ להיות וכ׳ enables him to be righteous &c. Ḥull. 140ᵃ מַכְשִׁיר an offering which makes fit for admission to the Temple or eating sacred food, contrad. to מכפר an offering which procures atonement; Kidd. 57ᵃ, a. e.—Snh. 42ᵇ הוצא … מכשיר ומכפר ‘the carrying outside of the camp’ (Lev. IV, 12; 21) makes the act legal and procures atonement; ib. מכשיר ממכשיר עדיף ליה the analogy between one fitting act and another is preferred.—B. Kam. I, 2 הִכְשַׁרְתִּי את נזקו I have prepared (am responsible for) the damage, v. חוּב. Ib. הכשרתי (ב)מקצת נזקו וכ׳ wherever I am the partial cause of a damage (e.g. by completing a pit to its legally indictable depth), I am as responsible as if I had been the entire author. Gen. R. s. 56 the slaughtering knife is called מַאֲכֶלֶת (causing the eating) לפי שׁמַכְשֶׁרֶת את האוכלים (not שמכשר) because it makes the food fit for eating.—Esp. (with or without לקבל טומאה) to make an object fit for levitical uncleanness (v. Lev. XI, 34; 38). Ḥull. 35ᵇ וכי הדם מַכְשִׁיר … מַכְשֶׁרֶת is it the blood (as a liquid) which fits the meat for uncleanness?; is it not rather the slaughtering (because it makes it ‘an eatable’)?—Ib. 33ᵃ חיבת הקדש מַכְשַׁרְתָּן, v. חִבָּה; ib. 36ᵇ מַכְשַׁרְתָּהּ. Makhsh. VI, 6. Y. Gitt. I, 43ᶜ על מי בצים שאינן מַכְשִׁירִין that the liquid of eggs does not fit for uncleanness; Y. Shebi. VI, 36ᶜ top שאין כשירין (corr. acc.); a. v. fr.—V. הֶכְשֵׁר, מַכְשִׁירִין.