Jisho

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Godan verb with 'ru' ending, Intransitive verb
1. to put on airs; to assume importance; to be self-important; to be pretentious; to be pompous; to stand on one's dignityUsually written using kana alone
Other forms
勿体振る 【もったいぶる】
Notes
勿体振る: Rarely-used kanji form.

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