1. To cause to move in a wavelike motion.
  2. To cause to resemble a wave
  3. To move in wavelike motions.
  4. To appear wavelike.


  1. Wavy in appearance or form.
  2. Changing the pitch and volume of one's voice.
  3. Winding up and down gradually relative to the blade.

The above text is a snippet from Wiktionary: undulate
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