生かす・活かす|いかすikasu[2]nakadaka (mid-high)

JLPT N1approx.Common
Which spelling to use
生かす生かす is the more common spelling and is widely encountered in writing for the senses given here.
活かす活かす is less common than 生かす. It is also a mixed kanji-kana spelling and is the recommended default for beginners.
Definitions
  1. godan verb, transitive verbto make (the best) use of; to put to good use; to leverage (skills, attributes, experience, etc.); to capitalise on (experience, etc.)
    彼かれはわずかな収入しゅうにゅうを精せい一いち杯ばい活いかした。↗
    He made the best of his small income.
  2. godan verb, transitive verbto let live; to keep alive
    Live and let live.
  3. godan verb, transitive verbto revive; to resuscitate; to bring back to life
    We used emergency measures to revive the cardiac arrest patient.
  4. godan verb, transitive verbto restore (a deleted passage; in proofreading)
Conjugation
Dictionary form生かす(いかす)
Polite (masu)生かします(いかします)
Negative (nai)生かさない(いかさない)
polite (masen)生かしません(いかしません)
classical zu / nu生かさず・生かさぬ(いかさず・いかさぬ)
Past (ta)生かした(いかした)
polite (mashita)生かしました(いかしました)
Past negative (nakatta)生かさなかった(いかさなかった)
polite (masen deshita)生かしませんでした(いかしませんでした)
Te form生かして(いかして)
Potential生かせる(いかせる)
Passive生かされる(いかされる)
Causative生かさせる(いかさせる)
Causative passive生かさせられる(いかさせられる)
Conditional (ba)生かせば(いかせば)
tara生かしたら(いかしたら)
Volitional生かそう(いかそう)
polite (mashou)生かしましょう(いかしましょう)
Imperative生かせ(いかせ)

Common forms generated by rule; see the senses for honorific or irregular usage.

Transitive / intransitive pair
transitive生かすいかす⇄intransitive生きるいきる
魚さかなを生いかす
生きる describes a living thing’s own state of being alive; 生かす means to keep someone or something alive or to let them live.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese definitions
  1. 蘇よみがえらせる。蘇生そせいさせる。
  2. 生いきながらえさせる。
  3. 活用かつようする。
Kanji in this word
English equivalents
See also

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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