The Jargon File (version 4.4.7, 29 Dec 2003):

wrap around
 vi.

    (also n. wraparound and v. shorthand wrap)

    1. [techspeak] The action of a counter that starts over at zero or at minus
    infinity (see infinity) after its maximum value has been reached, and
    continues incrementing, either because it is programmed to do so or because
    of an overflow (as when a car's odometer starts over at 0).

    2. To change phase gradually and continuously by maintaining a steady
    wake-sleep cycle somewhat longer than 24 hours, e.g., living six long
    (28-hour) days in a week (or, equivalently, sleeping at the rate of 10
    microhertz). This sense is also called phase-wrapping.


The Free On-line Dictionary of Computing (30 December 2018):

wrap around

   (Or "wraparound", "wrap") The action of a counter that starts
   again at zero or at "minus infinity" (see infinity) after
   its maximum value has been reached, and continues
   incrementing, either because it is programmed to do so or
   because of an overflow (as when a car's odometer starts again
   at 0).

   [Jargon File]