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For a machine to function or work by starting its mechanical processes.
エンジンが動くと、車は走り始めます。
Once the engine operates, the car starts moving.
Often used in technical or mechanical contexts to describe the activation of machinery.
In Japanese, 動く can mean 'to move' (physical motion) or 'to operate' (functional activation). For machines, it typically refers to the latter unless context specifies physical movement (e.g., a robot arm moving).
機械が動く always refers to the machine's functional operation. For human movement, use 人が動く (hito ga ugoku).
機械 (kikai) means 'machine' and 動く (ugoku) means 'to move/operate'. The phrase combines these to describe the mechanical operation of a machine.
This phrase is commonly used in technical manuals, engineering contexts, or everyday descriptions of machinery. It implies intentional activation rather than accidental movement.