An archaic second-person singular form of 'brew,' meaning 'you brew' in old English.
From Old English 'brēowan' with the archaic second-person singular ending '-st,' similar to 'thou goest' or 'thou brewst.' This conjugation pattern was standard in Early Modern English but disappeared by the 1800s.
Words like 'brewst' are linguistic fossils—they show us exactly how English people spoke to each other during Shakespeare's time, with 'thou brewst' being how you'd address a brewer directly in the 16th century.
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