Jastrow: הָפֵר

הָפֵר m. (Inf. Hif. of פָּרַר, פּוּר; fr. Num. XXX, esp. verse 13) the law of ‘hafer’, the husband’s (or father’s) right of declaring void his wife’s (or daughter’s) vow, invalidation. Ned. X, 7, a. fr. את שבא לכלל הקם בא לכלל ה׳ whatever comes under the law of hakem (confirmation), comes under the law of hafer (invalidation), i.e. as you cannot confirm a vow before it has been made, so you cannot invalidate a vow in advance. Ib. 69ᵃ; 79ᵃ על הה׳ in a case where the right of invalidation might have been exercised. Tosef. ib. VII, 5 חומר בהקם שאינו בה׳ there are restrictions in the law of confirmation which do not apply to the law of invalidation &c. Y. ib. X, 42ᵃ bot. ה׳ נדרים מעת לעת, v. next w.; a. fr. [In comment. our w. is spelled הפר and הֵיפֵר indiscriminately, which would intimate that it is pronounced הֵפֵר, fr. Num. XXX, 9.]