Definition of heavy lifting in English:

heavy lifting

Syllabification: heav·y lift·ing

Entry from US English dictionary

noun

1The lifting of heavy objects.
1.1Hard or difficult work: the heavy lifting in this business is in designing external distribution systems

Definition of heavy lifting in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal