to prepare (e.g. beer or ale) by steeping, boiling, and fermentation or by infusion and fermentation
to prepare (e.g. tea) by infusion in hot water
(often + up) to contrive or plot (something)
They were brewing up a plan
to brew beer or ale
chiefly Brit to undergo infusion
He left the tea to brew
(often + up) to be in the process of formation
A storm is brewing in the east
brewer noun
[Old English brēowan]