Definition of glass over

The phrase "glass over" often appears in beer or wine tasting notes, but its origin is less well-known. The term does not refer to a literal glass being placed over the top of a drink, but instead is a tasting notation used to describe the appearance of the beverage's head or foam. When a beer or ale is poured, it often creates a thick, foamy head that settles on top of the liquid in the glass. This head, also known as the "head retention," can vary in color and texture depending on the style of the beer. The description "glass over" indicates that the beer has a head that is so dense and creamy that it appears to cover the entire surface of the glass. This is a desirable characteristic in beers with high hop content or high alcohol content, as it can help to protect the aroma and flavor from the air. However, the term "glass over" should not be taken too literally, as it can be misleading. The term simply refers to the appearance of the head and does not imply that the head is so thick that it will spill over the sides of the glass. In fact, a head that is too thick can be a sign of undercarbonation, which can lead to a flat, uninspired taste. In summary, "glass over" is a tasting notation used to describe a beer's head, indicating that it is so thick and creamy that it appears to cover the entire surface of the glass. It is a desirable characteristic that can help to protect the aroma and flavor of the beer, but should not be interpreted too literally.