作用
zuòyòng · HSK 2
function
⚙️ 作 = do/make + 用 = use → 'doing-use' = the effect/function something has
作 means to do or produce; 用 means to use or apply. Together they name the use-effect a thing produces — its action, function, or intended role. Common in science (chemical 作用) and everyday talk (起作用 = to take effect).
作 — person radical 亻 + 乍
作 combines the person radical 亻 with 乍, which originally depicted a sudden action or making something. The character means 'to do, make, or create,' with 亻 indicating human activity and 乍 supplying the sound. Over time it broadened to cover works, deeds, and acting as something.
用 — pictograph of a bucket or wooden pail
用 originally depicted a bucket or container, possibly a sacrificial vessel made of wood. Over time it was borrowed to mean 'to use' or 'employ,' losing its concrete object sense. The modern meaning 'use' has been standard since early classical Chinese.