Shudder

v. i.	1.	To tremble or shake with fear, horrer, or aversion; to shiver with cold; to quake. [imp. & p. p. Shuddered ;p. pr. & vb. n. Shuddering.] The shuddering tennant of the frigid zone. - Goldsmith.
n.	1.	The act of shuddering, as with fear.

Noun	1.	shudder - an almost pleasurable sensation of fright; "a frisson of surprise shot through him" Synonyms: frisson, quiver, tingle, chill, shiver, thrill
	2.	shudder - an involuntary vibration (as if from illness or fear) Synonyms: tremor
Verb	1.	shudder - shake, as from cold; "The children are shivering--turn on the heat!" Synonyms: shiver
	2.	shudder - tremble convulsively, as from fear or excitement Synonyms: shiver, thrill, throb

bang, be cold, bob, bobble, boot, bounce, bump, charge, chatter, chill, convulse, convulsion, didder, disquiet, disquietude, dither, dithers, falter, fidgetiness, fidgets, flush, flutter, freeze, freeze to death, grimace, grow cold, gyrate, have a chill, have an ague, have goose pimples, heaving, horripilate, hustle, inquietude, jactitate, jar, jerk, jig, jigget, jiggle, jog, joggle, jollies, jolt, jostle, jounce, jump, kick, lift, lose heat, palpitation, panting, paroxysm, perish with cold, pitapat, pitter-patter, quake, quaking, quaver, quavering, quiver, quivering, rattle, restlessness, rictus, rush, rush of emotion, sensation, shake, shakes, shaking, shimmy, shiver, shivers, shock, spasm, surge of emotion, thrill, throb, throbbing, tic, tingle, tingling, titillation, tremble, trembling, tremor, tremor of excitement, trepidation, trepidity, twitch, twitter, unrest, vibrate, vibration, wobble