יָסַף (b. h.; cmp. אָסַף) , Hif. הוֹסִיף to heap up, to add (with על). Snh. XI, 3 להוֹסִיף על דברי וכ׳ thus adding to the words of the Scribes (against Deut. IV, 2). Ib. 88ᵇ ויש בו להו׳ when there is a possibility to add. Ib. ואם ה׳ גורע and if he did add, he diminishes (violates the law). Ib. 29ᵃ המוֹסִיף, v. גָּרַע I. Tosef. Sabb. VI (VII), 17 והאומר הוֹסִיפוּ על השולחן (not ואומר) and who (from superstition) says, Add (put one more) to the table; a. fr.—Yalk. Lev. 559 מוֹסַפְנִי על וכ׳ (Sifra Metsora beg. מוסיף אני) I will add to what thou saidst.
Nithpa. - נִתּוֹסַף, נִיתּ׳, , Hithpa. הִתּוֹסַף to be added; to be added to, increase, wax. Mekh. Bo. s. 16; Yalk. Ex. 217 והשני נ׳ לו and the second name was added to the first (without abrogating the first). Ex. R. s. 7, beg. נ׳ לו עוד וכ׳ two additional years (of imprisonment) were given him. Sabb. 152ᵃ ת"ח … חכמתן מִתּוֹסֶפֶת עליהן Ms. M. (ed. חכמה נִיתּוֹסֶפֶת בהן) when scholars grow old, their wisdom grows with their age; ib. טפשותן מתוספת וכ׳, v. טִפְּשׁוּת.