“About-face” in Japanese
Short answer
About-face in Japanese is “一変” (ippen). Full meaning: complete change, about-face.
Other ways to say “About-face” in Japanese
転向
tenkou conversion, shift, about-face, switch
手のひら返し
tenohiragaeshi sudden reversal (of behavior, opinion, attitude, etc.), about-face, flip-flop
一転
itten one turn, spinning around; complete change, reversal, (an) about-face, sudden transformation
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