Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
silver-tongued is an adjective meaning "expressing yourself readily, clearly, effectively". It carries one recorded sense.
expressing yourself readily, clearly, effectively
“able to dazzle with his facile tongue”
“silver speech”
Definitions, synonyms and semantic relations for silver-tongued come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.