Definition of drainers:
(n) :
(chiefly US, Canada) A conduit allowing liquid to flow out of an otherwise contained volume; a plughole (UK)
(n) :
A natural or artificial watercourse which drains a tract of land.
(v) :
(transitive) To deplete of energy or resources.
(v) :
(transitive, ergative) To cause liquid to flow out of.
(v) :
(intransitive) To flow gradually.
(v) :
(intransitive) To lose liquid.