בִּטֵּל אֶת דְּבָרָיו, ביטל את דבריו

ביטוי (אנגלית)

Nullified his words

הגדרה (אנגלית)

Figuratively: disputed him, proved that he was mistaken, or did not follow his words.

("As long as Rabban Gamliel was alive, the halacha followed his words; after his death, R. Yehoshua sought to nullify his words" – Tosefta, Ta’anit, Lieberman edition, Ch. 2; and also: "But the sages said: whoever nullifies his words, the spirit of the sages does not rest upon him" – Tosefta, Bava Metzia, Lieberman edition, Ch. 3)