Noun holy of holies has 2 senses
  1. holy of holies - (figurative) something regarded as sacred or inviolable; "every politician fears to touch that holy of holies, the Social Security System"
    --1 is a kind of
    sacredness
  2. holy of holies, sanctum sanctorum - (Judaism) sanctuary comprised of the innermost chamber of the Tabernacle in the temple of Solomon where the Ark of the Covenant was kept
    --2 is a kind of sanctuary
    --2 is a part of Tabernacle
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