The term 'FAST SPORT' can be summarized by the crossword solution 'LUGE', which is a four-letter word. LUGE is a winter sport in which a person rides a small sled down an icy track while lying face up and feet first. It is considered to be one of the fastest and most dangerous sports in the world, as speeds can reach up to 140 km/h. LUGE is a popular Olympic sport and is practiced in many countries around the world.