Pass the tongue over is a phrase that means to LICK something. It is often used in reference to food, such as licking a spoon or licking one's lips. It can also be used to describe the act of tasting something, such as when a person passes their tongue over a piece of food to get a sense of its flavor. The phrase is also sometimes used figuratively, such as when someone passes their tongue over a situation to get a better understanding of it.