From Old English 'breowan,' from PIE *bhrew- (to boil, bubble) — brewing is etymologically boiling and fermenting.
To make beer or ale by soaking, boiling, and fermentation; to make tea or coffee by mixing with hot water; something brewed, especially beer.
From Old English 'breоwan' (to brew), from Proto-Germanic *brewwaną (to brew, to boil), from PIE *bʰrewh₁- meaning 'to boil, to bubble, to effervesce, to be in agitation.' The root captures the visual drama of fermentation and the action of heated liquid — both involve vigorous bubbling and transformation. Related PIE derivatives include Latin 'fervere' (to boil, to be hot, to seethe), which gave English 'fervent' and 'ferment,' and possibly the root of English 'bread' via the sense of leavening