heart and soul

heart and soul (uncountable)

1. The core of a thing; the most essential or important part.

   Synonyms: crux, gist; see also Thesaurus:gist

   The heart and soul of any democracy is its electorate.

2. Passion; true commitment.

   She put her heart and soul into the project.

   • 2024 July 22, Peter Baker, quoting Joe Biden, “Biden Vows to Campaign Hard for Harris, Saying, ‘I’m Not Going Anywhere’”, in The New York Times‎^[1], →ISSN:

     “I’m not going anywhere,” Mr. Biden said. “I know yesterday’s news was surprising and hard for you to hear,” he went on, “but it was the right thing to do. I know it’s hard because you poured your heart and soul into me to help us win this thing.”

heart and soul (not comparable)

1. With the utmost earnestness.