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about-turn

noun
🔊/əˌbaʊt ˈtɜːn/
🔊/əˌbaʊt ˈtɜːrn/
 (British English)
(also about-face North American English, British English)
[singular]
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  1. a complete change of opinion, plan or behaviour（意见、计划、行为的）彻底改变
    • The government did an about-turn over nuclear energy.政府对核能的态度来了个 180 度的大转变。🔊🔊
    Topics Opinion and argumentc2
    Word Originlate 19th cent. (originally as a military command): shortening of right about turn.