drench: [OE] Originally, drench meant simply ‘cause to drink’. It comes ultimately from the prehistoric Germanic verb *drangkjan, which was a causative variant of *drengkan (source of English drink) – that is to say, it denoted ‘causing someone to do the action of the verb drink’. That particular sense now survives only as a technical usage in veterinary medicine, but already by the Middle English period it had moved on metaphorically to ‘drown’ (now obsolete, and succeeded by the related drown) and ‘soak thoroughly’. => drink, drown
c. 1200, "to submerge, drown," from Old English drencan "give drink to, ply with drink, make drunk; soak, saturate; submerge, drown," causative of drincan "to drink" (see drink), from Proto-Germanic *drankijan (cognates: Old Norse drekkja, Swedish dränka, Dutch drenken, German tränken, Gothic dragkjan "to give to drink"). Sense of "to wet thoroughly by throwing liquid over" is from c. 1550. Related: Drenched; drenching.
