כּוּךְ, (= כוכו, v. כַּוָּוא) cavity, cave, esp. sepulchral chamber. [Taan. 25ᵇ כ׳ המחרישה R. Gersh. (Ms. M. כון, v. Rabb. D. S. a. l. note, ed. בֶּרֶךְ) the cavity made by the plough.]—Y. B. Bath. III, beg. 13ᵈ חמוכר … בכ׳ חזקה לכל הכ׳ if one sells a burial place (קבר) to his neighbor, as soon as the latter has buried one dead in the chamber, he has the possession of the entire chamber; a. e.—Pl. כּוּכִין. Ib. קבר … בג׳ כ׳ וכ׳ when he buried three dead in three different chambers &c. Tosef. Ohol. XVII, 11 [read:] … שדה … בתוכה היא כשדה כ׳ ואיזו היא שדה כ׳ כל חכ׳ לצדדין a field in which a grave (known to have been there) has disappeared, is like a field of sepulchral chambers. And what is a field &c.? Where you dig out (a square) in the ground, and make chambers in the walls. B. Bath. VI, 8; a. e.