起床
きしょう · kishou · JLPT N2 · noun
rise
⏰ 起 = rise + 床 = bed, so 起床 = rising out of bed
床 (bed) also appears in 床上 (on the bed). 起 (rise) appears in 起立 (stand up), which follows the same pattern of rising from a position.
起 — 走 (run) + 己 (self/phonetic)
起 combines 走 'run/walk' as the meaning component with 己 as the phonetic component. The 走 element suggests movement of the body, giving the core sense of rising up or starting to move. From there it extended to meanings like 'get up,' 'begin,' and 'arise.'
床 — 广 (shelter) + 木 (wood)
床 combines 广 (a roof or shelter) with 木 (wood), depicting a wooden piece of furniture kept indoors. Originally it referred to a low wooden platform or couch used for sitting and sleeping. Over time the meaning narrowed mainly to 'bed,' though it still appears in compounds for table-like stands.