What does "undulate" suggest about an object's movement?

The term "undulate" is often used to describe movement that resembles waves. When an object undulates, it moves in a smooth, wave-like manner, rising and falling or oscillating back and forth. This description evokes imagery of waves in water or the gentle motion of a flag in the breeze, emphasizing fluidity and grace rather than rigidity or erratic behavior.

Given this understanding, recognizing "wave-like" as the correct choice highlights the nature of undulating movement. It captures the essence of the term, illustrating a rhythmic and flowing quality that is characteristic of waves.