The word “Crosby” typically refers to a proper noun, often used as a surname or place name. Notably, it is associated with the famous American singer and actor Bing Crosby, who was a significant figure in music and film during the 20th century. Additionally, there are places named Crosby in various locations, including towns in the United Kingdom and the United States. If you have a specific context for “Crosby,” please provide it for a more tailored definition.