吻合
wěn hé · HSK 7
to be identical with
🧩 吻 kiss + 合 join = two things meet and close together perfectly, a flush fit
吻 is the lips/mouth and 合 means to close or join; together they describe parts that meet as snugly as lips pressing shut. Used when facts, edges, or accounts line up exactly.
吻 — mouth radical 口 + 勿 (wù, phonetic)
吻 is a semantic-phonetic compound. The mouth radical 口 gives the meaning, since 吻 originally referred to the lips or the area around the mouth. The component 勿 supplies the sound. From 'lips' the meaning extended to 'kiss,' the action lips perform.
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.