What does 効く mean?
効く is a Japanese verb meaning “to be effective” in English. It can also be translated as “to work, to be possible (to do, use, etc.), to taste (alcohol)” depending on context. It is written as 効く in kanji, きく in hiragana, and kiku in romaji. This word is part of JLPT N3 vocabulary.
Example sentences
この丸薬は心臓に効く。
These pills act on the heart.
よくもまあ私にそんな口がきけるね。
How dare you speak to me like that?
私は５万円までつけがきく。
My credit is good for 50,000 yen.