undulate
verb (used without object)
to move with a sinuous or wavelike motion; display a smooth rising-and-falling or side-to-side alternation of movement.
were undulating
-
past progressiveof undulate.past progressive
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Countless fingers of shadowy gray substance were undulating up the surface of the window, like pale angleworms or white serpents of many sizes, trying to climb up a pane of glass.
From Lords of the Stratosphere by Arthur J. Burks
On the other side were undulating pasture-lands on which grazed a few sheep.
From The Yates Pride, a romance by Mary Eleanor Wilkins Freeman
We traveled on over the river grounds, which were undulating, and covered with grass to the river brink.
From The Exploring Expedition to the Rocky Mountains, Oregon and California To which is Added a Description of the Physical Geography of California, with Recent Notices of the Gold Region from the Latest and Most Authentic Sources by John Charles Frémont
A few moments later the blue, crystal waters of Lake Superior were undulating beneath them.
From Doctor Jones' Picnic by S. E. (Samuel E.) Chapman
He saw that the portières to left of his range of vision were undulating.
From The House of Mystery An Episode in the Career of Rosalie Le Grange, Clairvoyant by Will Irwin
