Drooling refers to when someone's mouth is open and saliva is flowing out, often in a way that's embarrassing or hard to control.
When people say "drooling", they usually mean it literally - like when a baby is sucking on their pacifier and starts to drool. It can also be used to describe older adults who have trouble swallowing and may get a bit of saliva on their chin or shirt. But sometimes, in an exaggerated way, someone might say that they're "drooling" over something, meaning they're extremely excited or enthusiastic about it - like when you see your favorite food being carried out at a restaurant!
To secrete saliva, especially in anticipation of food.
The act of one who drools.
