👉 Foreflap is a type of sail that has a flat plane-like surface on its underside, often resembling a flapping wing. These sails are used in boats and can be made with various materials such as wood, metal, or even fabric. The term "foreflap" is commonly used to describe the surface of these sails, but it could also refer to any other type of sail that has a flat plane-like surface on its underside.