補充
ほじゅう · hojuu · JLPT N1 · noun
supplement
🔋 補 = patch up a shortfall, 充 = fill up: patch and fill to replenish
充 means fill or full, as in 充電 (charge a battery). 補 means patch or make up for what is missing. Together: fill up what has run short.
充 — 育 (raise/grow) on top of 儿 (legs/person)
Originally depicted a person walking forward, suggesting movement and advancement. The form combines a growth element above with a person below, evoking the sense of being filled up or made full as one grows. Over time, the meaning shifted from 'go forward' to 'fill, fulfill, abundant'.