WordNet sense 1 (a shaky motion):

palpitation, shakiness, vibration, trembling, quivering, shaking

WordNet sense 2 (an almost pleasurable sensation of fright):

chill, frisson, shiver, shudder, thrill, tingle

WordNet sense 3 (shake with fast, tremulous movements):

palpitate, quake

WordNet sense 4 (move with or as if with a regular alternating motion):

beat, pulsate

WordNet sense 5 (move back and forth very rapidly):

flicker, flutter, waver, flitter