What it means

1. verb turn inside out or upside down
2. verb hold back, as of a danger or an enemy
   “Arrest the downward trend”
3. verb retrace one's course
   “The hikers got into a storm and had to turn back”
4. verb force to go away
   “Drive away potential burglars”
5. verb go back to a previous state
   “We reverted to the old rules”