turn up, loosen, or remove earth; "Dig we must"; "turn over the soil for aeration"
do business worth a certain amount of money; "The company turns over ten million dollars a year"
turn from an upright or normal position; "The big vase overturned"; "The canoe tumped over"
turn upside down, or throw so as to reverse; "flip over the pork chop"; "turn over the pancakes"
think about carefully; weigh; "They considered the possibility of a strike"; "Turn the proposal over in your mind"
Synonymous with "cranks over," the action of the engine internal components rotating during the starting cycle. This is what happens when you turn the key before the engine starts.
An engine is said to turn over when the starter has caused the crankshaft to begin to turn, which starts the pistons moving so that combustion can begin to take place in the cylinders, providing power to move the car.