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have been undulating
  • present perfect progressive of undulate.

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.

A hundred yards away, at his left, there was water, a sea whose smooth rollers might have been undulating liquid emeralds that broke to infinite flashing gems upon the shore.

From Two Thousand Miles Below by Diffin, Charles Willard

We did not have a 38 multitude of waves in sight, but the sea floor itself might have been undulating.

From The Sea and the Jungle by Tomlinson, H. M. (Henry Major)