To cause liquid to go out from; empty, To become empty by the drawing off of liquid, To become gradually depleted; dwindle, transitive verb_ To draw off by degrees; to cause to flow gradually out or off; hence, to cause the exhaustion of, To filter, To deplete of energy or resources, noun_ Something consuming resources and providing nothing in return, The act of draining, or of drawing off; gradual and continuous outflow or withdrawal,