have a silver tongue / be silver-tongued
Eloquently and artfully persuasive in speech
He might not have much experience in politics, but he’s got a silver tongue and is bound to win over a great deal of voters on his charismatic speeches alone.
Tehát ékesszóló, meggyőző szónokról van szó.
Itt találkoztam vele:
[…] Cardan says, silver-tongued in his silver fox mask.
(Holly Black: The Cruel Prince, pg 255)