Synonym of UNDULATE

The correct answer is C. Wave.

An undulation is a wave-like movement or form. It can be caused by a number of things, such as wind, water, or sound. Undulations can be seen in many different things, such as the surface of a pond, the hair on a person’s head, or the sound waves produced by a musical instrument.

The other options are not synonyms of undulate. Retard means to slow down or delay something. Decrease means to make something

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