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- Mist hung in the air—hazy shreds of white that coiled and undulated as if they were alive.p. 15.6
- Her sandy robes shifted and folded, reminding Leo of the undulating fins on that stupid shrimpzilla monster they'd fought in the Atlantic.p. 393.3
- Nico stared at the tendrils of darkness undulating from the ruins.p. 489.1
There are no more uses of "undulate" in The House of Hades.
Typical Usage (best examples)