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

• As the evening wears on, the bodies of the dancers undulate with the rhythm of the drums.
• As the shimmering heat rose from the ground, the plain seem to slowly undulate as if the ground was heaving.
• The undulating ground afforded cover to the attacking enemy.

• ripple
• ruffle
• riffle
• cockle
• roll
• flap
• wave

News & Articles

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• Video tracks weird deep-sea oarfish
  Behold the oarfish, a bizarre beast the lives in the deep ocean, far offshore. Due to its remote home, little is known about the fish, whose dorsal fins delicately undulate as it glides about the deep.Much of what we know about the creature comes from specimens that have washed ashore or floated to the surface, but in the past few years, a number of videos of the fish have been captured and are ...
  June 11, 2013 - MSNBC
• Sea Serpent?26-Foot Fish
  Behold the oarfish, a bizarre beast the lives in the deep ocean, far offshore. Due to its remote home, little is known about the fish, whose dorsal fins delicately undulate as it glides about the deep.
  June 11, 2013 - Fox News
• Video Reveals Bizarre Deep-Sea Oarfish
  Behold the oarfish, a bizarre beast the lives in the deep ocean, far offshore. Due to its remote home, little is known about the fish, whose dorsal fins delicately undulate as it glides about the deep.
  June 10, 2013 - LiveScience.com via Yahoo! News