Jisho

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Expressions (phrases, clauses, etc.)
1. cannot do without something; indispensable; absolutely necessaryUsually written using kana alone, See also 無くてはいけない なくてはいけない
Expressions (phrases, clauses, etc.)
2. have to doUsually written using kana alone, See also 無くてはいけない なくてはいけない, after negative base of verb

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