がい 害をなす Show inflections LinksSentence search for 害をなすSentence search for がいをなすSentence search for 害を成すKanji details for 害Edit in JMdict Expressions (phrases, clauses, etc.), Godan verb with 'su' ending1. to cause harm (to)See also 害する がいする, usu. ...に〜Other forms害を成す 【がいをなす】 Discussions Log in to talk about this word.