Etymology: Middle English draynen, from Old English drēahnian — more at dry
Date: before 12th century
transitive verb1obsolete:filter 2 a: to draw off (liquid) gradually or completely <drained all the water out>b: to cause the gradual disappearance of <drain the region's wealth>c: to exhaust physically or emotionally <feeling drained at the end of a long workday> 3 a: to make gradually dry <drain a swamp>b: to carry away the surface water of <the river that drains the valley>c: to deplete or empty by or as if by drawing off by degrees or in increments <drained the country of its resources>d: to empty by drinking the contents of <drain a mug of beer> 4:drop 7c, sink<drained the putt>intransitive verb1 a: to flow off gradually b: to disappear gradually :dwindle 2: to become emptied or freed of liquid by its flowing or dropping <waiting for the tub to drain> 3: to discharge surface or surplus water