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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
heavy-duty is an adjective meaning "designed for heavy work". It carries one recorded sense.
designed for heavy work
“a heavy-duty detergent”
“heavy-duty gloves”
Definitions, synonyms and semantic relations for heavy-duty come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.