Refers to a machine that converts energy into mechanical motion, commonly used for car engines, aircraft engines, and similar devices.
This car's engine is very quiet.
Please fasten your seatbelt before starting the engine.
I started the car's engine and set off.
On cold days, the engine doesn't start easily.
Please turn off the engine after parking.
The engine suddenly stopped on the highway.
I heard the sound of an engine from far away.
door engine; automatic door operator