undulate
verb
1. stir up (water) so as to form ripples
Similar word(s): cockle, riffle, ripple, ruffle
Definition categories: motion, flow, flux
2. occur in soft rounded shapes
Similar word(s): roll
Definition categories: stative
3. move in a wavy pattern or with a rising and falling motion
- The curtains undulated
Similar word(s): flap, roll, wave
Definition categories: motion, move
4. increase and decrease in volume or pitch, as if in waves
- The singer's voice undulated
Definition categories: change