vibrate
     v 1: shake, quiver, or throb; move back and forth rapidly,
          usually in an uncontrolled manner
     2: move or swing from side to side regularly; "the needle on
        the meter was oscillating" [syn: {oscillate}]
     3: be undecided about something; waver between conflicting
        positions or courses of action; "He oscillates between
        accepting the new position and retirement" [syn: {hover},
        {vacillate}, {oscillate}]
     4: sound with resonance; "The sound resonates well in this
        theater" [syn: {resonate}]
     5: feel sudden intense sensation or emotion; "he was thrilled
        by the speed and the roar of the engine" [syn: {thrill}, {tickle}]
Source: WordNet® 2.0