What is the meaning of turn back?

verb

• Retrace one's course.
  • usage: "The hikers got into a storm and had to turn back"
  • synonyms: backtrack, double back
• Go back to a previous state.
  • usage: "We reverted to the old rules"
  • synonyms: revert, return, retrovert, regress
• Force to go away; used both with concrete and metaphoric meanings.
  • usage: "Drive away potential burglars"; "drive away bad thoughts"; "dispel doubts"; "The supermarket had to turn back many disappointed customers"
  • synonyms: chase away, drive out, drive away, dispel, drive off, run off
• Hold back, as of a danger or an enemy; check the expansion or influence of.
  • usage: "Arrest the downward trend"; "Check the growth of communism in South East Asia"; "Contain the rebel movement"; "Turn back the tide of communism"
  • synonyms: check, arrest, stop, contain, hold back
• Turn inside out or upside down.
  • synonyms: invert, reverse