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Tremble

v. i.
  1. To shake involuntarily, as with fear, cold, or weakness; to quake; to quiver; to shiver; to shudder; -- said of a person or an animal.
  2. To totter; to shake; -- said of a thing.
  3. To quaver or shake, as sound; to be tremulous; as the voice trembles.

n.
  1. An involuntary shaking or quivering.