愈合
yù hé · HSK 7
to heal
🩹 愈 heal + 合 join = a wound joins back together and closes
愈 means to recover or heal; 合 means to join or close. Together they describe edges of a wound coming together. The hé here is the same 合 as in close or combine, so 愈合 is the healing that closes a gap.
合 — 乛 (lid/roof) + 口 (mouth)
Originally a pictograph of a lidded vessel — a cover (亼) closing over an opening (口) — giving the core sense of 'come together, join, fit.' From 'fit/match' it extended to 'combine, unite, agree' and to measure-word uses. The reading hé reflects this 'joining' meaning.