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Exact Match:

holy of holies

(Judaism) sanctuary comprised of the innermost chamber of the Tabernacle in the temple of Solomon where the Ark of the Covenant was kept

(figurative) something regarded as sacred or inviolable; "every politician fears to touch that holy of holies, the Social Security System"

Synonyms:

• adytum,
• ashram,
• cabinet,
• cell,
• cloister,
• closet,
• den,
• hermitage,
• hideaway,
• hideout,
• hiding place,
• ivory tower,
• lair,
• mew,
• privacy,
• recess,
• retreat,
• sacrarium,
• sanctuary,
• sanctum,
• sanctum sanctorum,
• secret place,
• the holy,
• the ineffable,
• the inenarrable,
• the inexpressible,
• the numinous,
• the unspeakable,
• the unutterable