ねつはい 熱が入る Show inflections LinksSentence search for 熱が入るSentence search for ねつがはいるKanji details for 熱 and 入Edit in JMdict Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending, Intransitive verb1. to become keen on; to get passionate about Discussions Log in to talk about this word.