back sb up Meaning in the Cambridge English Dictionary
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Meaning of “back sb up” in the English Dictionary

"back sb up" in British English

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back sb up

phrasal verb with back uk   us   /bæk/ verb
B2 to ​support or ​help someone: My ​familybacked me up ​throughout the ​courtcase.C2 to say that someone is ​telling the ​truth: Honestly, that's ​exactly what ​happened - Claire will back me up. Will you back me up if I say that I never ​saw him?
(Definition of back sb up from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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