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Godan verb with 'su' ending, transitive verb
to exert (influence), to exercise, to cause (e.g. damage), to do (e.g. harm), to bring about (e.g. benefits), to extend, to have an effect (on)
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あなたに被害を及ぼそうなどとは夢にも思いませんでした。
Little did I dream of doing you any harm.
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