Meaning of 無くてはいけない in Japanese

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無く いけ ない

  1. Words

Definition of 無くてはいけない

  1. (exp) cannot do without something; indispensable; absolutely necessary

    君はもう大人なんだから、もっと分別がなくてはいけない。
    Now that you are grown-up, you ought to know better.

  2. (after negative base of verb) have to do

    すぐに手紙をかかなきゃいけないよ。
    You've got to write to him quickly.

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