Etymology

silver tongue

sil·ver tongue

Today it means: The trait of being articulate and clever at speaking, often in a deceitful way. Full definition →

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The story

From silver (adjective, noun) + tongue (noun). Sense 1 (“trait of being articulate and clever at speaking”) is probably from silver-tongued, which is attested earlier than the noun.

Etymology from Wiktionary, CC BY-SA 4.0.