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.
Used to express actions, events, or states that have not yet occurred but are expected to happen.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
In a moment, while you gaze, that form will be prone, those bright, cold eyes malignant, that wily grace will undulate into motion and glide away.
From Literary and Social Essays by George William Curtis