undulate

Meanings

• stir up (water) so as to form ripples
• occur in soft rounded shapes
• move in a wavy pattern or with a rising and falling motion
  • "The curtains undulated"
• increase and decrease in volume or pitch, as if in waves
  • "The singer's voice undulated"
• having a wavy margin and rippled surface

Synonyms

cockle, flap, riffle, ripple, roll, ruffle, wave