'To speak fair' definitions:

Definition of 'To speak fair'

From: GCIDE

Fair \Fair\, adv. Clearly; openly; frankly; civilly; honestly; favorably; auspiciously; agreeably. [1913 Webster]
Fair and square, justly; honestly; equitably; impartially. [Colloq.]
To bid fair. See under Bid.
To speak fair, to address with courtesy and frankness. [Archaic] [1913 Webster]