A diesel engine, an internal-combustion engine that burns heavy oil, A fuel derived from petroleum (or other oils) but heavier than gasoline/petrol Used to power diesel engines which burn this fuel using the heat produced when air is compressed, verb_ To ignite a substance by using the heat generated by compression, automotive For a spark-ignition internal combustion engine to continue running after the electrical current to the spark plugs has been turned off This occurs when there's enough heat in the combustion chamber to ignite the air/fuel without a spark, the same way heat and pressure cause ignition in a diesel engine, intransitive verb_ To drive a diesel-powered vehicle, To refuel a diesel-powered vehicle Often used with up, To drive a diesel-powered vehicle