Definition of the holy of holies noun from the Oxford Advanced Learner's Dictionary

     

    the holy of holies

     noun
    noun
    BrE
     
    ; NAmE
     
    [singular]
     
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  1. 1the most holy part of a religious building
  2. 2(humorous) a special room or building that can only be visited by important people
See the Oxford Advanced American Dictionary entry: the holy of holies