尽くす
つくす · tsukusu · JLPT N1 · verb-godan
to devote
尽 — hand 彐 holding brush over fire 灬
Originally depicted a hand holding a brush sweeping out the last embers in a vessel, suggesting 'finishing' or 'using up.' The simplified form 尽 replaces the older 盡, but keeps the core meaning of exhausting or completing something fully.