Definition - undulate

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undulate
  1. having a wavy margin and rippled surface
  2. increase and decrease in volume or pitch, as if in waves; "The singer's voice undulated"
  3. move in a wavy pattern or with a rising and falling motion; "The curtains undulated"; "the waves rolled towards the beach"
  4. stir up (water) so as to form ripples
  5. occur in soft rounded shapes; "The hills rolled past"