From The Collaborative International Dictionary of English v.0.48 [gcide]:
Drain \Drain\ (dr[=a]n), v. t. [imp. & p. p. Drained
(dr[=a]nd); p. pr. & vb. n. Draining.] [AS. drehnigean to
drain, strain; perh. akin to E. draw.]
1. To draw off by degrees; to cause to flow gradually out or
off; hence, to cause the exhaustion of.
[1913 Webster]
Fountains drain the water from the ground adjacent.
--Bacon.
[1913 Webster]
But it was not alone that the he drained their
treasure and hampered their industry. --Motley.
[1913 Webster]
2. To exhaust of liquid contents by drawing them off; to make
gradually dry or empty; to remove surface water, as from
streets, by gutters, etc.; to deprive of moisture; hence,
to exhaust; to empty of wealth, resources, or the like;
as, to drain a country of its specie.
[1913 Webster]
Sinking waters, the firm land to drain,
Filled the capacious deep and formed the main.
--Roscommon.
[1913 Webster]
3. To filter.
[1913 Webster]
Salt water, drained through twenty vessels of earth,
hath become fresh. --Bacon.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
drained \drained\ adj.
having lost much energy or emotion from vigorous activity; --
of people; as, the day's events left her completely drained
of strength.
[WordNet 1.5]
2. having resources completely depleted.
Syn: depleted.
[WordNet 1.5]
3. having no power remaining; -- of a battery.
Syn: run-down.
[WordNet 1.5]
to go down the drain
1. to be consumed in profitless activity; to be wasted; to
become worthless.
2. to vanish or cease existing.
[PJC]
From WordNet (r) 3.0 (2006) [wn]:
drained
adj 1: emptied or exhausted of (as by drawing off e.g. water or
other liquid); "a drained marsh"; "a drained tank"; "a
drained and apathetic old man...not caring any longer
about anything" [ant: undrained]
2: very tired [syn: knackered, drained]
3: drained of electric charge; discharged; "a dead battery";
"left the lights on and came back to find the battery
drained" [syn: dead, drained]