means putting a lot of energy and enthusiasm into something
with sincerity and commitment
with complete honesty and loyalty
He’s dedicated to the project heart and soul.
She’s thrown herself heart and soul into her studies.
Mary was an extremely dedicated employee and put her heart and soul into this project.
Idioms are the heart and soul of any language, someone can say.
I really put my heart and soul into this chocolate cake, so I hope you like it.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.