holy of holies   (TTS Sound)

The noun holy of holies has 2 senses

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


• 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)