How do cease a engine fast?

To quickly cease an engine, you can turn off the ignition key or press the engine stop button if available. In a situation where the engine needs to be stopped immediately, you can also disconnect the battery or pull the fuel shut-off valve, if equipped. Always ensure safety measures are followed and be aware of the engine's condition to avoid damage. Lastly, consult the vehicle's manual for specific procedures, as they may vary by model.