Определение и Значение "(chilled|frozen) to the marrow"

What is the origin of the idiom "chilled to the marrow" and when to use it?

The idiom "chilled to the marrow" has its origin in the belief that the marrow, the innermost part of the bones, is the coldest part of the human body. It metaphorically represents an extreme level of coldness that penetrates deep into a person's core, suggesting a profound and bone-chilling sensation. The phrase conveys the idea of feeling intensely cold and thoroughly chilled to the very core of one's being.