What is 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 called?

vibrate — 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. (Webster's 1913.)