Definition
When an engine turns over, it signifies that its components are moving to initiate the operation of the engine.
（引擎）运转，翻动
When I turn the key, the engine starts to turn over.
当我转动钥匙时，引擎开始转动。
If your car's engine won't turn over, it might be due to a dead battery.
如果你的汽车引擎无法转动，可能是因为电池没电了。
The technician checked the engine to ensure it could turn over properly.
技术人员检查了引擎，以确保它能正常转动。