about-face

Noun
  1. Act of pivoting 180 degrees, especially in a military formation (synset 100347762)
  2. A major change in attitude or principle or point of view (synset 100164227)
    "an about-face on foreign policy"
Verb
  1. Turn, usually 180 degrees (synset 201913035)
  2. Change one's mind and assume the opposite viewpoint (synset 200690810)

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