座敷
ざしき · zashiki · JLPT N2 · noun
room
座 = sit, 敷 = spread out: a room where you sit on laid-out floor mats
座 means seat or sit, and 敷 means lay out or spread, as with bedding. Together they name a formal Japanese room with tatami floor mats, where people sit and eat on the floor.
座 — 广 (shelter) + 坐 (to sit)
Originally written as 坐, meaning 'to sit' (two people 人人 sitting on the ground 土). The shelter radical 广 was added to specify the place where one sits — a seat, throne, or platform. 坐 remained the verb 'to sit,' while 座 became the noun 'seat.'
敷 — 尃 (fū, phonetic) + 攵 (action)
敷 is a semantic-phonetic compound. The right side 攵 (a hand holding a stick) suggests an action, while 尃 supplies the sound and the idea of spreading or distributing. The original sense was to spread out or apply broadly, which extends to modern meanings like 'to apply' (ointment) or 'to lay out'.