Shudder
/ˈʃʌdə/
noun
A shivering tremor, often from fear or horror.
A moment of almost pleasurable fear; a frisson.
Synonyms: jiggle, quake, quiver, rumble, quiver, shiver, thrill, tingle
verb
To shake nervously, often from fear or horror.
To vibrate jerkily.
Synonyms: flutter, jiggle, shake, wiggle, palpitate, quake, shake, shiver