| 1. holy of holies | |
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(figurative) something regarded as sacred or inviolable
"every politician fears to touch that holy of holies, the Social Security System";
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| 2. holy of holies [ Synonyms: sanctum sanctorum] | |
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(Judaism) sanctuary comprised of the innermost chamber of the Tabernacle in the temple of Solomon where the Ark of the Covenant was kept
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