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

     n 1: the act of moving back and forth [syn: waver, flicker]
     2: abnormally rapid beating of the auricles of the heart
        (especially in a regular rhythm); can result in heart
     3: a disorderly outburst or tumult; "they were amazed by the
        furious disturbance they had caused" [syn: disturbance,
        disruption, commotion, turmoil, stir, hurly burly,
     4: the motion made by flapping up and down [syn: flap, flapping,
     v 1: move along rapidly and lightly; skim or dart [syn: flit, fleet,
     2: move back and forth very rapidly, as of a candle [syn: flicker,
         waver, flitter, quiver]
     3: beat rapidly, of the heart [syn: palpitate]
     4: wink briefly; "bat one's eyelids" [syn: bat]