Definitions of shiver:

• noun:   reflex shaking caused by cold or fear or excitement
• noun:   an almost pleasurable sensation of fright
• verb:   shake, as from cold

  Example: "The children are shivering--turn on the heat!"

• verb:   tremble convulsively, as from fear or excitement
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #6838)