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- One of the creatures had retreated within its shell; the others were hurrying away upon their undulating, skirtlike bellies.50 — Snalgi for Two (72% in)
- The snalgli's eyeballs waved even faster, and then it charged at him, the edges of its flat belly undulating.53 — A Question of Character (69% in)
There are no more uses of "undulate" in Inheritance.
Typical Usage (best examples)