Definition:
A reliquary is a special container or box used to hold and display religious relics, which are objects that have special importance because they are connected to a saint or holy figure.
In more advanced contexts, you might find reliquary used metaphorically to describe any container or place that preserves something precious, not just in a religious sense.
While reliquary specifically refers to a container for religious relics, it can also be used in a broader sense to refer to any cherished container or place that holds memories or significant items.
There are no well-known idioms or phrasal verbs directly related to reliquary, but you might hear phrases like "to treasure something" or "to hold dear" when discussing the importance of items kept in a reliquary.
A reliquary is a significant and often ornate container for religious relics, particularly those associated with saints.