holy of holies noun
1 the holy of holies : the most holy part of a Jewish temple 2 [singular] humorous : something (such as a place or event) that is thought of as very special and which only a few people are allowed to use, see, etc.
▪ His trophy room is the holy of holies where only his closest friends are allowed.
▪ His trophy room is the holy of holies where only his closest friends are allowed.
