Find out what "undulating" means

"Undulating?" What the heck does that mean? You search your bag for a dictionary, but alas, there are no dictionaries in your bag. After coming to terms with this minor setback. You head down to your local library.

  Once at the library, you track down the dictionaries, and look up "undulating," only to discover that it means "to move in waves or with a smooth, wavelike motion".  Boring!  Find something better to do.

Unconfirmed