n. 25B6; verb
a valve for draining the tank : EMPTY (OUT), void, clear (out), evacuate, unload.
drain off any surplus liquid : DRAW OFF, extract, withdraw, remove, siphon off, pour out, pour off; milk, bleed, tap, void, filter, discharge.
the water drained away to the sea : FLOW, pour, trickle, stream, run, rush, gush, flood, surge; leak, ooze, seep, dribble, issue, filter, bleed, leach.
more people would just drain our resources : USE UP, exhaust, deplete, consume, expend, get through, sap, strain, tax; milk, bleed.
he drained his drink : DRINK (UP/DOWN), gulp (down), guzzle, quaff, down, imbibe, sup, swallow, finish off, toss off, slug; informal sink, swig, swill (down), polish off, knock back, put away.
fill.
25B6; noun
the drain filled with water : SEWER, channel, conduit, ditch, culvert, duct, pipe, gutter, trough; sluice, spillway, race, flume, chute.
a drain on the battery : STRAIN, pressure, burden, load, tax, demand.