about turn

/AH0 B AW1 T T ER1 N/
noun
  1. 1

    Of a formation of soldiers, to reverse the direction in which they are facing; an about face.

  2. 2

    A complete change of opinion, direction, etc.

verb
  1. 1

    To turn to face the opposite direction.

Source: https://en.wiktionary.org/wiki/about%20turn