To call someone a knave (scoundrel) or to treat someone as a dishonest person.
From 'be-' prefix combined with 'knave,' from Old English 'cnafa' meaning boy or servant, which evolved to mean dishonest person or rogue.
The word 'knave' survives today mainly in playing cards and historical insults—'beknave' shows how the 'be-' prefix could transform insults into actions, making verbal abuse more vivid.
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