A sturdy or robust person, especially one built for heavy labor; a person with a strong back.
From 'heavy' + 'back,' a compound noun combining two simple terms. This is a descriptive compound that would have emerged from colloquial speech describing physical characteristics, likely from working-class or maritime contexts.
Compound nouns like 'heavyback' show how English creates new vocabulary through simple composition—even though it's not in standard dictionaries anymore, speakers instinctively understand it! This is how all compound words were born before dictionaries froze meaning.
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