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

Type of: cognitive content, content, mental object

Encyclopedia: Heart and soul