About-turn meaning

Total reversal of opinion or attitude.
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(intransitive) To turn 180 degrees, typically in a military formation.
verb
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Turnabout, turn about, turn-about.
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(UK, military) Of a formation of soldiers, to reverse the direction in which they are facing; an about face. [First attested in the mid 20th century.]
noun
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(UK, figuratively, idiomatic) A complete change of opinion, direction, etc. [First attested in the mid 20th century.]
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(intransitive, military) To turn to face the opposite direction. [First attested in the mid 20th century.]
verb
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A turn of 180 degrees, typically in a military formation.
noun
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Origin of about-turn

  • From the imperative phrase used in the military.

    From Wiktionary