き 効く Common word JLPT N3 Wanikani level 11 Wanikani level 25 Play audio Show inflections LinksSentence search for 効くSentence search for きくSentence search for 利くKanji details for 効Edit in JMdict Godan verb with 'ku' ending, Intransitive verb1. to be effective; to take effect; to be good (for)See also 薬が効く, usu. 効くこのがんやく丸薬はしんぞう心臓にき効く。These pills act on the heart.Godan verb with 'ku' ending, Intransitive verb2. to work; to function wellSee also 目が利く, usu. 利く for body senses, functions, etc.よくもまあわたし私にそんなくち口がきけるね。How dare you speak to me like that?Godan verb with 'ku' ending, Intransitive verb3. to be possible (to do, use, etc.); to be able toSee also 割引が効くわたし私は５まん万えん円までつけがきく。My credit is good for 50,000 yen.Godan verb with 'ku' ending, Transitive verb4. to taste (alcohol); to trySee also 聞くOther forms利く 【きく】 Discussions Log in to talk about this word.