From Old English 'drincan' — its causative 'drench' (to cause to drink) and past participle 'drunk' both took independent lives.
To take a liquid into the mouth and swallow it.
From Old English 'drincan,' from Proto-Germanic *drinkaną, of disputed deeper origin. Some scholars connect it to PIE *dʰreg- (to draw, to pull), suggesting the original image was 'to draw in' liquid. Others see it as a specifically Germanic innovation without