shud·der 
(shŭdər)
(shŭdər)intr.v. shud·dered, shud·der·ing, shud·ders
1. To shiver convulsively, as from fear or revulsion. See Synonyms at shake.
2. To vibrate; quiver: The airplane shuddered in the turbulence.
n.
1. A convulsive shiver, as from fear or revulsion.
2. A vibration or trembling motion.
[Middle English shodderen, perhaps of Middle Dutch or Middle Low German origin.]
shudder·ing·ly adv.