Jisho

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Expressions (phrases, clauses, etc.), Godan verb with 'su' ending
1. to do (someone) a wrong; to do (someone) an ill turn; to take revenge
Expressions (phrases, clauses, etc.), Godan verb with 'su' ending
2. to resent; to bear a grudge
Other forms
仇成す 【あだなす】仇為す 【あだなす】寇なす 【あだなす】
Notes
仇成す: Rarely-used kanji form. 仇為す: Rarely-used kanji form. 寇なす: Rarely-used kanji form.

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