Definitions from Wiktionary (dead weight)

▸ noun:  Unremitting heavy weight that does not move.
▸ noun:  (nautical) The largest weight of cargo a ship is able to carry; i.e, the weight of a ship when fully loaded minus its weight when empty.
▸ noun:  (construction) A dead load.
▸ noun:  (figuratively) That which is useless or excess; that which slows something down.
▸ noun:  (rail transport) The total (unpowered) weight of a train to be propelled (or hauled) by the locomotive; another locomotive being hauled dead as part of the train is a dead weight.
▸ adverb:  (of a shot in snooker or other cue sports) With just enough weight for a ball to drop into a pocket, or come to rest in a precisely determined position.

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