quiver (http://definr.com/quiver)

     n 1: an almost pleasurable sensation of fright; "a frisson of
          surprise shot through him" [syn: frisson, shiver, chill,
           shudder, thrill, tingle]
     2: a shaky motion; "the shaking of his fingers as he lit his
        pipe" [syn: shaking, shakiness, trembling, quivering,
         vibration, palpitation]
     3: case for holding arrows
     4: the act of vibrating [syn: vibration, quivering]
     v 1: shake with fast, tremulous movements" [syn: quake]
     2: move back and forth very rapidly, as of a candle [syn: flicker,
         waver, flitter, flutter]