开机
kāi jī · HSK 2
to boot up
💻 开 = open + 机 = machine; opening the machine = boot it up
开 means open/start and 机 means machine or device. Together 开机 literally reads as open-the-machine, covering booting a computer, starting an engine, or kicking off a film shoot (rolling the camera).
开 — two hands 廾 + door 门 (open gate)
Originally written 開, showing two hands (廾) lifting the bar (一) off a gate (門) to open it. The simplified form 开 keeps the two-hands element and drops the gate. Core meaning 'to open' extended to 'start, operate, bloom'.