These verbs mean to move back and forth, up and down, or to and fro: Swing usually applies to arclike movement of something attached at one extremity and free at the other: The ship's lanterns swung violently in the raging storm.Oscillate literally refers to a steady back-and-forth motion, as that of a pendulum; figuratively, it denotes vacillation, as between conflicting purposes: “a king … oscillating between fear of Rome and desire of independence” (Walter Besant). Sway suggests the movement of something unsteady, light, or flexible: “thousands of the little yellow blossoms all swaying to the light wind” (W.H. Hudson). To rock is to swing gently or rhythmically or sway or tilt violently: “The ruins of the ancient church seemed actually to rock and threaten to fall” (Sir Walter Scott). Vibrate implies quick periodic oscillations; it can also suggest trembling, pulsating, or quivering: “Music, when soft voices die,/Vibrates in the memory” (Percy Bysshe Shelley). Fluctuate implies fairly constant alternating change: “Prices fluctuated violently from the irregularity of the crops” (Lesley B. Simpson). Undulate refers to smooth wavelike movement: “gleaming seaweed that curls and undulates with the tide” (Willa Cather). Waver suggests unsteady, uncertain movement: A police officer stopped the driver who was wavering from lane to lane.
Testing is begun when the temperature reaches 66° by slowly drawing the slide open and reclosing it, the speed being regulated by the swing of a pendulum supplied with the instrument.
In order to understand the sharp swing of the political pendulum back from republicanism to autocracy which took place at Brumaire, it is needful to remember that the virtual failure of the Egyptian Expedition was then unknown.
There had already been other schisms on such questions as the right way to swing a censer and the legality of self-immolation for the Lord's sake.
Lori nodded and struggled off the porch swing, her swollen stomach a reminder that babies were still an option for some people.