about face, to do an

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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 Copyright © 2013 by Christine Ammer
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