noun
a complete reversal of direction or opinion
verb
to make a complete reversal of direction or opinion
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The military commander ordered an about-turn in strategy after analyzing the enemy's movements.
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I was heading to the store, but then I did an about-turn when I realized I forgot my wallet.
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The teacher made us do an about-turn on our project because she didn't like the direction we were going.
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After years of pursuing a career in finance, she made an about-turn and decided to follow her passion for art instead.