Origin: before 900; Middle English drenchen,Old English drencan, causative of drincan to drink; cognate with Dutch drenken,German tränken to water, give to drink
from O.E. drencan "cause to drink," caus. of drincan "to drink," from P.Gmc. *drankijan. In M.E., it meant "to drown;" sense of "to wet thoroughly by throwing liquid over" is from c.1550. Related: Drenched; drenching.