尽
ジン, サン, つ.くす, つ.くす, づ.くし, つ.く, づ.く, ず.く, つ.きる, つ.かす, さかづき, ことごと.く, つか, つき

exhaust, use up, run out of, deplete, befriend, serve

JLPT1 G7 S6 F1234

皿 dish/plate/bowl + an element# representing liquid dripping from a brush → ink dripping from a brush into a bowl → *use up*; *exhaust*; *run out of* (← use up the last of one's ink) → *give one's utmost*; *devote oneself to*; *be an extreme of*.

[Full Kanji Etymology List]