おに 鬼になる Show inflections LinksSentence search for 鬼になるSentence search for おにになるKanji details for 鬼Edit in JMdict Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending1. to harden one's heart; to steel oneself; to be ruthlessIdiomatic expressionExpressions (phrases, clauses, etc.), Godan verb with 'ru' ending2. to become "it" (in hide-and-seek, etc.) Discussions Log in to talk about this word.