Definition of heavy lifting noun from the Oxford Advanced Learner's Dictionary

 

heavy lifting

 noun
noun
BrE BrE//ˌhevi ˈlɪftɪŋ//
 
; NAmE NAmE//ˌhevi ˈlɪftɪŋ//
 
[uncountable]
 
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hard or difficult work The film still has a lot of heavy lifting to do to make $40 million. Much of the heavy lifting in this report was done by the expert writers.