1
general::
Also, chilled to the marrow. Extremely or bitterly cold, as in After skiing in the wind for five hours straight, I was chilled to the bone. These hyperboles replaced the earlier idea of one's blood freezing and are more picturesque than the current synonym frozen.
American Heritage Idioms
2
general::
Phrase(s): *chilled to the bone
Fig. very cold. (*Typically: be ~; get ~.) • I got chilled to the bone in that snowstorm. • The children were chilled to the bone from their swim in the ocean.
McGrawhill's American Idioms And Phrasal Verbs