Definition of about-turn noun from the Oxford Advanced Learner's Dictionary



BrE BrE//əˌbaʊt ˈtɜːn//
; NAmE NAmE//əˌbaʊt ˈtɜːrn//
(British English) (also about-face North American English, British English) [singular]
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a complete change of opinion, plan or behaviour The government did an about-turn over nuclear energy. Word Origin late 19th cent. (originally as a military command): shortening of right about turn.