The term deadweight or dead weight may refer to:The economics concept deadweight loss.Deadweight tonnage is an expression of a ship's carrying capacity, including the weight of the crew, passengers, cargo, fuel, ballast, drinking water, and stores.Deadweight (song), a song by Beck from the A Life Less Ordinary SoundtrackThe extra weight on a machine part that lowers its performance when not in use. For example, the main engine on a rocket becomes dead weight when the propellant is used up. For t… (More on Deadweight)