about face, to do an

about face, to do an

To reverse a decision or change one’s opinion. The term comes from the American military command to turn 180 degrees at attention, dating from the mid-nineteenth century, and by 1900 was being used figuratively. A more recent colloquial usage is to do a 180, but it has not yet reached cliché status.
The Dictionary of Clichés by Christine Ammer
See also:
  • happy as a clam (at high tide)
  • good buddy
  • miss one's guess, to
  • make an honest woman (out) of (someone)
  • make an honest woman of
  • make an honest woman of her
  • make an honest woman of somebody
  • make an honest woman of someone
  • apples and oranges, like comparing
  • mavin