back sb up - definition in the Learner's Dictionary - Cambridge Dictionaries Online

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English definition of “back sb up”

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back sb up

phrasal verb with back
 
 
/bæk/ verb
SUPPORT B2 to support or help someone: My family backed me up in my fight for compensation.Backing, supporting and defendingDefending and protecting
SAY IS TRUE to say that someone is telling the truth: Honestly, that's exactly what happened - Claire'll back me up.Proving and disproving
(Definition of back sb up from the Cambridge Learners Dictionary © Cambridge University Press)
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