To move sinuously
To have or cause to have a curved or sinuous form or surface
undulate it was undulating with one reasonable hill would sum it up for me.
The keys on the keyboard undulate in a slow sine wave.
undulate in a slow sine wave.
undulate tee shot is required to set up the chance of playing over the water to reach the huge but undulating green.
undulate's design concept focuses heavily on developing an organic, lush and green park, with softly undulating hills.