替代
tìdài · HSK 4
replace
🔄 替 = replace/substitute + 代 = generation/era → swap one for another
替 means substitute and 代 means take the place of (also generation). Together 替代 doubles down on the substitution sense. Cognate logic: each character already means replace, so the compound is emphatic — to stand in for.
替 — two 夫 (man) over 曰 (say)
Originally written with two 立 (stand) over 白, depicting two people side by side, suggesting replacement or alternation. The form evolved to two 夫 over 曰. The core meaning shifted from 'decline/abolish' to 'replace, substitute for'.
代 — person radical 亻 + 弋 (stake/dart, phonetic)
代 is a semantic-phonetic compound: 亻 (person) gives the meaning and 弋 supplies the sound. The original sense was one person taking the place of another, which broadened to 'substitute,' 'replace,' and then 'generation' or 'era' — successive groups of people replacing the previous.