Jisho

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Godan verb with su ending, intransitive verb
1. to pose as; to (successfully) impersonate; to pretend to be; to pass oneself off as; to disguise oneself asUsually written using kana alone
Godan verb with su ending, intransitive verb
2. to (completely) become; to (fully) turn intoUsually written using kana alone
Other forms
成り済ます 【なりすます】なり済ます 【なりすます】成済ます 【なりすます】

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