Canceled it in his heart
He canceled the matter in his thought. He gave up on the issue.
("A person should not say... rather he says... and the vow is nullified by itself. Rabbi Yoḥanan said: and it is necessary that he cancel it in his heart" – Nedarim 77b)
Translation
Expression (Hebrew)
בִּטֵּל בְּלִבּוֹ, ביטל בליבו
Definition (Hebrew)
בִּטֵּל אֶת הַדָּבָר בְּמַחְשַׁבְתּוֹ. וִיתֵּר עַל הָעִנְיָן.
("לֹא יֹאמַר אָדָם... אֶלָּא אוֹמֵר... וְהַנֶּדֶר בָּטֵל מֵאֵלָיו. אָמַר רַבִּי יוֹחָנָן: וְצָרִיךְ שֶׁיְּבַטֵּל בְּלִבּוֹ" – נְדָרִים ע״ז ע״ב)