Sooth'say` intransitive verb [ Sooth + say ; properly to say truth, tell the truth.] To foretell; to predict. 'You can not soothsay .' Shak. 'Old soothsaying Glaucus' spell.' Milton. Found on http://www.encyclo.co.uk/webster/S/145
Sooth'say` noun 1. A true saying; a proverb; a prophecy. [ Obsolete] Spenser. 2. Omen; portent. Having « God turn the same to good soothsay .» Spenser. Found on http://www.encyclo.co.uk/webster/S/145