צְחוֹק, laughter, merriment. Gen. R. s. 53 (ref. to Gen. XXI, 9 מצחק) אין הלשין הזה של צ׳ וכ׳ this expression of merriment (use of the root צחק) alludes to idolatry (by ref. to Ex. XXXII, 6); … to bloodshed (by ref. to II Sam. II, 14); Tanḥ. Sh’moth 1; Tosef. Sot. VI, 6. Ib.; Gen. R. l. c. אין … צ׳ אלא לשון ירושה this ‘merriment’ refers to the joy over the heirloom (the birth of a legitimate heir to Abraham, whereas Yishmael claimed the birthright as the firstborn).