Meaning of “back off” - Learner’s Dictionary

back off

phrasal verb with back uk us /bæk/ verb
MOVE

B2 to move away from someone, usually because you are afraid:

I saw the knife and backed off.
STOP SUPPORTING mainly US

to stop supporting a plan:

The president has backed off from a threat to expel UN soldiers.

(Definition of “back off” from the Cambridge Learner’s Dictionary © Cambridge University Press)