Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
tub-thumper is a noun meaning "a noisy and vigorous or ranting public speaker". It carries one recorded sense.
a noisy and vigorous or ranting public speaker
Definitions, synonyms and semantic relations for tub-thumper come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.