silver tongue

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silver tongue (plural silver tongues)

1. (idiomatic) The trait of being clever at speaking, often in a deceitful way.
   • 1835, Edward Bulwer-Lytton, “The Festival”, in Rienzi, The Last of the Roman Tribunes‎:

     While these, and yet more contradictory, comments followed the exit of the Tribune, he passed into the saloon, where Nina presided; and here his fair person and silver tongue […] won him a more general favour with the matrons than he experienced with their lords, […]

• silver-tongued