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Definición de “back sb up” en inglés

back sb up

verb uk phrasal verb with back   /bæk/ us  
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 Learner's Dictionary & Thesaurus © Cambridge University Press)
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