📖 WordNook

undulate

adjective
  1. having a wavy margin and rippled surface
verb
  1. increase and decrease in volume or pitch, as if in waves
    “The singer's voice undulated”
  2. move in a wavy pattern or with a rising and falling motion
    “The curtains undulated”
    roll
  3. stir up (water) so as to form ripples
    riffle
  4. occur in soft rounded shapes
    roll