やくだ 役立つ Common word JLPT N1 Show inflections LinksSentence search for 役立つSentence search for やくだつSentence search for 役だつKanji details for 役 and 立Edit in JMdict Godan verb with 'tsu' ending, Intransitive verb1. to be useful; to be helpful; to serve the purposeOther forms役だつ 【やくだつ】 Discussions Log in to talk about this word.