Definition of heart and soul

noun (n)

• the choicest or most essential or most vital part of some idea or experience (noun.cognition)

  Synonym: center, centre, core, essence, gist, heart, inwardness, kernel, marrow, meat, nitty-gritty, nub, pith, substance, sum
  

  Example:
  The heart and soul of the Republican Party.
  

  source: wordnet30

adverb (r)

• with complete faith (adv.all)

  Example:
  She was with him heart and soul.
  

  source: wordnet30

Visual Synonyms (Thesaurus)

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