Archaic second person singular form of 'dare,' meaning 'you dare' or 'you would dare'; used in older English and biblical contexts.
From Middle English 'darste,' the past tense of 'durren' (to dare), from Old English 'durran.' This archaic form appears in texts like the King James Bible where 'thou darst' means 'you dare.'
When you read old Bible passages and see 'thou darst not,' that 'darst' is the original form of 'dare'—English speakers used to conjugate verbs completely differently, and 'darst' is a ghost of that ancient grammar system!
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