back sb up Meaning, definition in Cambridge English Dictionary
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Meaning of "back sb up" - English Dictionary

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back sb up

phrasal verb with back uk   us   /bæk/ verb
B2 to support or help someone: My family backed me up throughout the court case.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 Learners Dictionary & Thesaurus © Cambridge University Press)
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