about-face

[n. uh-bout-feys, uh-bout-feys; v. uh-bout-feys]
noun
1.
Military. a turn of 180° from the position of attention.
2.
a complete, sudden change in position, direction, principle, attitude, etc.: They've done an about-face in their foreign policy.
verb (used without object), about-faced, about-facing.
3.
to execute an about face.
4.
to turn in the opposite direction.
5.
to switch to an opposite opinion.

Origin:
1860–65, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
about-face

noun
1. act of pivoting 180 degrees, especially in a military formation 
2. a major change in attitude or principle or point of view; "an about-face on foreign policy" 

verb
1. turn, usually 180 degrees 
2. change one's mind and assume the opposite viewpoint 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
Example sentences
The trial served as a useful smoke screen but it did not signify any political
  about-face.
He may even benefit politically from the about-face, particularly as he will
  continue in the position of deputy prime minister.
The first couple's about-face stems from their declining political fortunes.
Such an arbitrary about-face cannot be countenanced.
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