oscillate

It’s an immediately familiar side of Agatha because we’ve watched her oscillate, even begrudgingly, between these two poles of her existence on the Witches Road as she became more protective over and envious of Billy and his growing power.

While countries like ours may “oscillate a bit and become more or less democratic,” de Mesquita said, there has “never” in history been a mature democracy that has slid into authoritarianism, dictatorship or autocracy.

The national governments oscillate between empowering and funding the commission, and seeking to control it, blame it for failures and grab the credit for successes.

The authors observed that like an ocean wave forming and then crashing on to a shoreline, the signals from the neocortex oscillate between on and off states in intervals while a person or animal sleeps.

Everything has a certain frequency that it likes to vibrate -- or oscillate at.