Drain  —v. 1 draw off liquid from. 2 draw off (liquid). 3 flow or trickle away. 4 dry or become dry as liquid flows away. 5 exhaust of strength or resources. 6 a drink to the dregs. B empty (a glass etc.) By drinking the contents. —n. 1 a channel, conduit, or pipe carrying off liquid, sewage, etc. B tube for drawing off discharge etc. 2 constant outflow or expenditure.  down the drain colloq. Lost, wasted. [old english: related to *dry]