Wiss meaning

(archaic) To know, to understand.
verb
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Origin of wiss

  • Perhaps an alteration of wis, taken from the incorrect division of iwis (which means "sure(ly), certain(ly)", from Middle English iwis, ywis (“sure(ly), certain(ly)”), from Old English gewis (“certain, positive, sure”)) as "I wis(s) ", which was mistaken for a verb. Perhaps from (certainly akin to) Old English witan (“to know”). See wit.
    From Wiktionary