According to

Tidal locking

The effect arises between two bodies when their gravitational interaction slows a body's rotation until it becomes tidally locked. Over many millions of years, the interaction forces changes to their orbits and rotation rates as a result of energy exchange and heat dissipation. When one of the bodies reaches a state where there is no longer any net change in its rotation rate over the course of a complete orbit, it is said to be tidally locked.

Is there any planet or satellite in the solar system in the process of getting tidally locked?

  • $\begingroup$ interesting question! $\endgroup$ – uhoh Jan 24 at 13:27
  • 2
    $\begingroup$ Probably nearly all of them that are not already tidally locked, although for some of them the process will take inordinately long. $\endgroup$ – antlersoft Jan 24 at 16:15

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