ゆうこうつか 有効に使う Show inflections LinksSentence search for 有効に使うSentence search for ゆうこうにつかうKanji details for 有, 効 and 使Edit in JMdict Expressions (phrases, clauses, etc.), Godan verb with 'u' ending1. to make good use of; to use to one's advantage Discussions Log in to talk about this word.