开工
kāi gōng · HSK 7
to start a construction job
🏗️ 开工 = open/start (开) + work (工) = work starts up
开 kāi is the same start as 开始; 工 gōng is labor or engineering work (as in 工人 worker). Together: a factory or construction job opens up and gets going.
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'.