JMdict: 1591100

効く 【きく】

  1. [v5k,vi] to be effective; to take effect; to be good (for)
  2. [v5k,vi] to work; to function well
  3. [v5k,vi] to be possible (to do, use, etc.); to be able to
  4. [v5k,vt] to taste (alcohol); to try
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
効 Merit, Efficacy, Efficiency, Benefit コウ き.く, ききめ, なら.う 5

Words often seen with this one: (experimental feature)

薬 (41), よく (40), にも (25), 海 (25), この (21), 鼻 (15), こと (14), 一番 (13), いい (11), 人 (11), こんな (10), という (10)