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"

back off (Verb)

To move backwards away from something.

back off (Verb)

To become less aggressive, particularly when one had appeared committed to act.

back off (Verb)

To lower the setting of.