Breastsummer is a rarely used architectural term that refers to a transverse beam that rests across the tops of the walls between two gables. There are a few alternative names for this element in building design, such as a lug beam or a collar beam. The term breastsummer is commonly used in Britain, while in America, it is referred to as a wall plate or a tie beam. Essentially, all of these synonyms refer to the same structural component that helps support the upper parts of a building. While the term may not be well-known to the average person, it remains an important element in traditional architecture.