From Longman Dictionary of Contemporary Englishsilver tonguesilver tongueliterary if you have a silver tongue, you can talk in a way that makes people like you or persuades them that you are right → tongue
Examples from the Corpus
silver tongue• A man with a silver tongue like you should be out making a million dollars for himself, like my son.• Ruth thought it more likely that his silver tongue had got around her.• But unlike Douglass he had no oratorical gift, no passionate language, no silver tongue. 