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English definition of “180”

180

noun [C usually singular] uk   /ˌwʌnˈeɪ.t̬i/ US informal us  
a sudden change from a particular opinion, decision, or plan to an opposite one: Jack's done a 180 and agreed to come on the trip.
(Definition of 180 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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