knew, viz. 1st and 3rd person singular of the irregular verb "wit" which means "to know""
► uses
Uses:
God wot I need not be too severe about others;
Charlotte Brontë. Jane Eyre (1847)
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Ah well I wot that a new broom sweeps clean, and a new garment makes thee leave off the old though it be fitter, and new wine causes thee to forsake the old, though it be better
John Lyly. Euphues: The Anatomy of Wit (1578)
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'As by lot, Got wot,'
William Shakespeare. Hamlet.
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This was thine oath, and mine also certain;
I wot it well, thou dar'st it not withsayn*, *deny
Chaucer. The Canterbury Tales, and Other Poems
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Wost* thou not well the olde clerke's saw, *2nd person singular form
That who shall give a lover any law?
Geoffrey Chaucer. The Canterbury Tales, and Other Poems
* This verb is used in Canterbury tales hundreds of times