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back out

phrasal verb with back
 
 
/bæk/ verb

Definition

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 Learner's Dictionary & Thesaurus © Cambridge University Press)
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