0 the part of a building or organization where few people are allowed to go, especially where the most important or secret work is done:
1 the holiest part of a religious building, especially the Jewish temple
I've found out since that they didn't allow photographers in there. This was their holy of holies.
The Treasures Room at the British Library is a unique bibliographic holy of holies.
The stage of the old theatre is his 'holy of holies'.
Do not regard that immediate neighbourhood as a holy of holies, never to be touched or entrenched upon.
Were we allowed to appear before the holy of holies, wiping our noses on the mat before we dared to enter?
You talked about comitology as if it were the holy of holies, as if it were our primary objective!
They invaded the holy of holies, the banking system.
