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English definition of “back out”

back out

verb uk phrasal verb with back   /bæk/ us  
B2 to decide not to do something that you had said you would do: You agreed to come. You can't back out now! They backed out of the deal the day before they were due to sign the contract.Changing your mind
(Definition of back out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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