[hair stand on end] {informal} The hair of your head rises stiffly upwards as a sign or result of great fright or horror.
* /When he heard the strange cry, his hair stood on end./* /The sight of the dead man made his hair stand on end./
Compare: BLOOD RUN COLD, HEART IN ONE'S MOUTH, HEART STAND STILL, JUMP OUT OF ONE'S SKIN, SPINE-CHILLING.