reverse

verb
  1. to change something to its opposite direction, position, or order
  2. to move backward or in the opposite direction
  3. to cancel or overturn a decision, judgment, or process
noun
  1. the opposite or contrary of something
  2. the back side of something, especially a coin or medal
  3. a gear that makes a vehicle move backward
adjective
  1. opposite in direction, position, or order

Examples