تعریف و معنای "[shiver|chill] (down|up) {one's} spine"

What is the origin of the idiom "shiver down one's spine" and when to use it?

The origin of the idiom "shiver down one's spine" likely stems from the physiological response of shivering or experiencing chills when one feels cold or frightened. The sensory nerves along the spine can transmit signals that produce a shivering sensation, and this physical reaction is often associated with strong emotions such as fear, excitement, or anticipation. It can also be used to describe intense moments of excitement or awe, such as experiencing a breathtaking performance or witnessing a remarkable event.