verb (v)

• retrace one's course(verb.motion)

  Example:
  The hikers got into a storm and had to turn back.
  

  Synonym:
  backtrack, double back
  

  source: wordnet30
• go back to a previous state(verb.change)

  Synonym:
  regress, retrovert, return, revert
  

  source: wordnet30
• force to go away; used both with concrete and metaphoric meanings(verb.motion)

  Example:
  The supermarket had to turn back many disappointed customers.
  

  Synonym:
  chase away, dispel, drive away, drive off, drive out, run off
  

  source: wordnet30
• hold back, as of a danger or an enemy; check the expansion or influence of(verb.competition)

  Example:
  Turn back the tide of communism.
  

  Synonym:
  arrest, check, contain, hold back, stop
  

  source: wordnet30
• turn inside out or upside down(verb.change)

  Synonym:
  invert, reverse
  

  source: wordnet30