效应
xiàoyìng · HSK 7
effect
🦋 效 = effect/efficacy + 应 = respond; together an effect, as in 蝴蝶效应 butterfly effect
效 carries the sense of efficacy or result, and 应 means to respond or react. Combined, 效应 names the response an action produces — an effect. The famous 蝴蝶效应 (butterfly effect) uses this exact word.
应 — 广 (shelter) + 心 (heart) + 隹 (bird)
Originally written 應, this character combined a phonetic component with 心 (heart) to suggest 'responding from the heart' or 'answering a call'. The simplified form 应 keeps the top portion. Over time it broadened from 'respond/answer' to also mean 'should' or 'ought to'.