shiver
     n 1: reflex shaking caused by cold or fear or excitement [syn: {tremble},
           {shake}]
     2: an almost pleasurable sensation of fright; "a frisson of
        surprise shot through him" [syn: {frisson}, {chill}, {quiver},
         {shudder}, {thrill}, {tingle}]
     v 1: tremble convulsively, as from fear or excitement [syn: {shudder},
           {throb}, {thrill}]
     2: shake, as from cold; "The children are shivering--turn on
        the heat!" [syn: {shudder}]
Source: WordNet® 2.0