acknow

CIDE DICTIONARY

acknow, v. t. [Pref. a- + know; AS. oncnāwan.].

To recognize. B. Jonson. [1913 Webster]
To acknowledge; to confess. Chaucer. [1913 Webster]
"We say of a stubborn body that standeth still in the denying of his fault, This man will not acknowledge his fault, or, He will not be acknown of his fault." [1913 Webster]

To be acknown (often with of or on), to acknowledge; to confess. [Obs.]