irresolute/ to hesitate/ yes-and-no man/ to blow hot and cold
By metaphor: one who wavers about the matter. Hesitates. Incapable of deciding (literal: holding in his hand both the yes and the no in a relaxed manner).
("What is the honor of the upper and the honor of the lower? No and no, and there is a cure in her hand." Rashi: "And there is a cure in her hands - the remedy in his mouth was a cure, whether to forbid or to permit" - Shabbat 13:1).
Translation
Expression (Hebrew)
הֵן וְלָאו וְרָפֶה בְּיָדוֹ
Definition (Hebrew)
בְּהַשְׁאָלָה: מְפַקְפֵּק בַּדָּבָר. מְהַסֵּס. אֵינוֹ מְסֻגָּל לְהַחֲלִיט (מִלּוּלִית: מַחֲזִיק בְּיָדוֹ אֶת הַכֵּן וְאֶת הַלֹּא בְּצוּרָה רְפוּיָה בְּיָדוֹ).
("כֹּבֶד הָעֶלְיוֹן וְכֹבֶד הַתַּחְתּוֹן מַהוּ?אִין וְלָאו וְרַפְיָא בִּידֵהּ". רָשִׁ"י:"וְרָפִיא בְּיָדֶיהָ- רְפוּיָה הָיְתָה הַתְּשׁוּבָה בְּפִיו, אֵם לֶאֱסֹר אֵם לְהַתִּיר"- שַׁבָּת קיג ע"א).