What does it mean to untap a permanent?

Untapping a permanent refers specifically to the action of rotating it back to an upright position from being turned sideways. In the context of Magic: The Gathering, when a permanent is tapped, it often indicates that it has been used for a particular purpose, such as attacking or producing mana. To untap it means to return it to its normal, active state, allowing it to be used again in the current or future turns. This is crucial for gameplay because only untapped permanents can perform actions such as attacking or utilizing abilities that require them to be untapped.

Other choices do not accurately describe the action of untapping. Turning a permanent sideways denotes tapping it, not untapping. Destroying a permanent is an entirely different action that removes it from play, and making a permanent unable to attack refers to a status effect that can be placed on it, which is unrelated to the concept of untapping.