shudder

(noun) an almost pleasurable sensation of fright. Synonyms: frisson, shiver, chill, quiver, thrill, tingle. Example: "A frisson of surprise shot through him."

(noun) an involuntary vibration (as if from illness or fear). Synonyms: tremor.

(verb) shake, as from cold. Synonyms: shiver. Example: "The children are shivering--turn on the heat!."

(verb) tremble convulsively, as from fear or excitement. Synonyms: shiver, throb, thrill.