Meaning of the word "heavy lifting" in English

What does "heavy lifting" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

heavy lifting

US /ˌhev.i ˈlɪf.tɪŋ/
UK /ˌhev.i ˈlɪf.tɪŋ/
"heavy lifting" picture

Idiom

1.

the most difficult or demanding part of a task or project

Example:
She did all the heavy lifting for the presentation.
We need someone to do the heavy lifting on this new project.
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