A smooth tongue - Idioms by The Free Dictionary
a silver/smooth tongue (redirected from a smooth tongue)
Oratory skills that are particularly eloquent, artful, seductive, and/or persuasive. He might not have much experience in politics, but his silver tongue is bound to win over a great deal of voters.
a ˌsilver/ˌsmooth ˈtongue the ability to talk in a very pleasing and polite way, to make people do what you want: It was his silver tongue that got him the job. ▶ ˌsilver-ˈtongued, ˌsmooth-ˈtongued adj.: smooth-tongued salesmen