speak with a forked tongue

speak with a forked tongue

Fig. to tell lies; to try to deceive someone. Jean's mother sounds very charming, but she speaks with a forked tongue. People tend to believe Fred because he seems plausible, but we know he speaks with a forked tongue.
See also: forked, speak, tongue
References in periodicals archive ?
We all know that many politicians speak with a forked tongue and as a scientist I regret to say not all scientists are reliable.