heavy lifting is a noun meaning "difficult work". It carries one recorded sense.
difficult work
“the boss hoped the plan would succeed but he wasn't willing to do the heavy lifting”
colloquialism
Definitions, synonyms and semantic relations for heavy lifting come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.
147,478 entries in AltF Lexicon, every one with its syllables marked.
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