Jisho

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Adverb (fukushi), Noun which may take the genitive case particle 'no'
1. abruptly; suddenly; all of a sudden; without warningUsually written using kana alone
Other forms
行き成り 【ゆきなり】
Notes
行き成り: Rarely-used kanji form. 行き成り: Rarely-used kanji form.

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