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Noun: heart and soul
  1. The choicest or most essential or most vital part of some idea or experience
    "the heart and soul of the Republican Party";
    - kernel, substance, core, center [US], centre [Brit, Cdn], essence, gist, heart, inwardness, marrow, meat, nub, pith, sum, nitty-gritty [informal]
Adverb: heart and soul
  1. Completely, with total commitment
    "she was with him heart and soul";
    - body and soul

Type of: cognitive content, content, mental object

Encyclopedia: Heart and soul