1. stir up (water) so as to form ripples

    Synonyms : cockle, riffle, ripple, ruffle
    Type Of : flux, flow
  2. move in a wavy pattern or with a rising and falling motion

    Synonyms : flap, roll, wave
    Type Of : move
    Examples :
    • The curtains undulated
  3. occur in soft rounded shapes

    Synonyms : roll
  4. increase and decrease in volume or pitch, as if in waves

    Type Of : change
    Examples :
    • The singer's voice undulated
  5. having a wavy margin and rippled surface