turn back

1. (intransitive) To reverse direction and retrace one's steps.

   Realising he had forgotten his briefcase, he turned back and re-entered the office.

   • 1914, Louis Joseph Vance, chapter III, in Nobody, New York, N.Y.: George H[enry] Doran Company, published 1915, OCLC 40817384 ↗:

     Turning back, then, toward the basement staircase, she began to grope her way through blinding darkness, but had taken only a few uncertain steps when, of a sudden, she stopped short and for a little stood like a stricken thing, quite motionless save that she quaked to her very marrow in the grasp of a great and enervating fear.

2. (transitive) To cause to reverse direction and retrace one's steps.

   The barrage of machine-gun fire turned back the encroaching soldiers.

3. To return to a previous state of being.

   He stopped drinking for a couple of years, but now he has turned back to his old ways.

   Once we take this decision, there's no turning back.

4. (transitive) To prevent or refuse to allow passage or progress.

   The soldiers turned back all the refugees at the frontier.

5. (transitive) To adjust to a previous setting.

   In Autumn we normally turn the clocks back one hour.

   I love that song: turn back to it!

6. (transitive) To fold something back; to fold down.

   When you make the bed, please always turn the sheet back over the blanket.

7. (obsolete, transitive) To give back; to return.

• (reverse direction) about turn, about face
• (fold) fold, fold back
• (prevent passage) drive away, repel, stop

• turn back the clock