undulate

verb

1. (transitive)To cause to move in a wavelike motion.

   “Breath vocalized, i.e., vibrated and undulated.”

2. (transitive)To cause to resemble a wave.
3. (intransitive)To move in wavelike motions.

   “His tongue undulated.”

   “Come lovely and soothing death, / Undulate round the world, serenely arriving, arriving, / In the day, in the night, to all, to each, / Sooner or later delicate death.”

4. (intransitive)To appear wavelike.

adj

1. Wavy in appearance or form.
2. Changing the pitch and volume of one's voice.
3. sinuous, winding up and down.