定休日
ていきゅうび · teikyuubi · JLPT N2 · noun
vacation
🏪 定 fixed + 休 rest + 日 day = the fixed day a shop is closed
定 means fixed or set, 休 means rest, and 日 means day. Together they name the set day each week when a shop stays closed.
定 — roof 宀 + 正 (correct/upright, phonetic)
Originally written with 宀 (roof) over 正 (upright/correct), suggesting a household settled and orderly under its roof. Over time 正 simplified to 㐬-like form at the bottom, and the meaning shifted from 'settled home' to the broader senses of 'fix, stable, decide.'
日 — pictograph of the sun
日 is a pictograph of the sun, originally drawn as a circle with a dot or stroke inside representing the sun's substance. Over time the round shape was squared off into the modern rectangular form. It means 'sun' and by extension 'day'.