(of a fire) to stop burning because there is nothing more to burn The fire had burnt (itself) out before the fire engines arrived.
to stop working or to make something stop working because it gets too hot or is used too much The clutch has burnt out.
to become extremely tired or sick by working too hard over a period of time If he doesn't stop working so hard, he'll burn himself out. By the age of 25 she was completely burned out and retired from the sport. related noun burnout