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Meaning of “back sb up” - Learner’s Dictionary

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 Learner’s Dictionary © Cambridge University Press)
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