Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
smouldering is an adjective meaning "showing scarcely suppressed anger". It carries one recorded sense.
showing scarcely suppressed anger
“her tone was...conversational although...her eyes were smoldering”
Definitions, synonyms and semantic relations for smouldering come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.