Merriam-Webster's Collegiate® Dictionary, 11th Edition
DRENCH
I. noun Date: before 12th century a poisonous or medicinal drink,
2. something that drenches, a quantity sufficient to drench or saturate,
II. transitive verb
Etymology: Middle English, from Old English drencan; akin to Old English drincan to drink Date: before 12th century
1. to force to drink, to administer a drench to (an animal), to wet thoroughly (as by soaking or immersing in liquid), to soak or cover thoroughly with liquid that falls or is precipitated, to fill or cover completely as if by soaking or precipitation , see: soak drencher noun