drain definition of drain by
Chambers 20th Century Dictionary(0.00 / 0 votes)Rate this definition: Drain. drÄn, v.t. to draw off by degrees: to filter: to clear of water by drains: to make dry: to drink dry: to exhaust.âv.i. to flow off gradually.ân. a watercourse: a ditch: a sewer: (slang) a drink: exhausting expenditure.âadj.