A canopy over a four-poster bed is a type of bedding that has been popular for centuries. It consists of a frame with four posts, usually made of wood or metal, and a fabric canopy that is draped over the top. The canopy provides a sense of privacy and protection from drafts, as well as a decorative touch. The term 'canopy over a four-poster bed' can be abbreviated to the six-letter word 'TESTER.'