The definition of impermanence is momentariness.
It is synonymous with disintegration.
An impermanent phenomenon goes through the stages of generation, abiding and disintegration. The lower view asserts the step abiding in-between generation and disintegration.
That is the go-stop-go view, which is not possible. Upon generation there is no moment of rest, but the generated phenomenon is already disintegrating.
In such a way we are never at rest, but rather in a constant state of change.
The Buddha said that among recognitions, the recognition of impermanence leaves the deepest impression, similar to the foot step of the elephant being the deepest among the animals.