Definitions for back off
back up, back off, back down(verb)
move backwards from a certain position
"The bully had to back down"
chicken out, back off, pull out, back down, bow out(verb)
remove oneself from an obligation
"He bowed out when he heard how much work was involved"
Kernerman English Learner's Dictionary
to stop attacking or criticizing
Just back off and leave him alone!
To move backwards away from something.
To become less aggressive, particularly when one had appeared committed to act.
To lower the setting of.