Jisho

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Godan verb with 'ru' ending, Intransitive verb
1. to become tense; to be tightened; to become firm (e.g. body)
Other forms
引き締る 【ひきしまる】引きしまる 【ひきしまる】引締まる 【ひきしまる】
Notes
引き締る: Irregular okurigana usage.

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