Phrasal verbs back
back off (to move backward): He backed off, when he saw the knife.
(to stop bothering someone): Back off, Benjamin! Let me also run my own life!
(to not do something that you had agreed to do): Lucas backed off when he realized how much work was involved.
to back down (to stop arguing or fighting for something): Neither side is willing to back down.
back out (to refuse to do something that you had promised to do): Lily made a promise and she can’t back out of it now.
back up ( to support someone): I’ll back you up throughout the court case.
(to make a copy of computer information): Back up your files in the same way everyday.
(move backward): I need everyone to back up a little.
(to form a line due to congestion: Traffic backed up for miles on the road to the coast.