What does "vibrate" mean?

Additional senses

1. 2.To affect with vibratory motion; to set in vibration. Breath vocalized, that is, vibrated or undulated, may . . . impress a swift, tremulous motion. Holder. Star to star vibrates light. Tennyson.
2. 3.To move to and fro, or from side to side, as a pendulum, an elastic rod, or a stretched string, when disturbed from its position of rest; to swing; to oscillate.
3. 4.To have the constituent particles move to and fro, with alternate compression and dilation of parts, as the air, or any elastic body; to quiver.
4. 5.To produce an oscillating or quivering effect of sound; as, a whisper vibrates on the ear. Pope.
5. 6.To pass from one state to another; to waver; to fluctuate; as, a man vibrates between two opinions.