Phrasal verb: back up

  1. back something up
    Transitive, Separable
    Meaning: reverse
    Example: Back up your car so that you can avoid the fire hydrant.

I remember my first time driving after I passed my driving exam and received my license.  I was backing up my car to pull out of the driveway, and I crashed into my dad’s car!  Luckily there was not much damage, just a small scratch to his driver-side mirror.

2.  back someone up
     Transitive, Separable
     Example: I trust that my family will always back me up when I need them.