Translation of "back sb up" - English-Mandarin Chinese dictionary
back sb up — phrasal verb with back /bæk/ verb
› to support or help someone
My family backed me up throughout the court case.
Backing, supporting and defendingDefending and protecting › 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?
Proving and disproving