Archaic second-person singular form of 'do,' used in older English as in 'thou doest' (you do), particularly in Biblical and Shakespearean texts.
From Old English 'dōst,' the second-person singular form of 'dōn.' The '-est' suffix marked second-person forms in Old and Middle English, surviving longest in religious texts.
If you read Shakespeare or the King James Bible, you're reading English frozen in time—'thou doest' and 'thou art' are like linguistic fossils that show how different English grammar used to be.
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