back_off
1. [ verb ] move backwards from a certain position
Synonyms: back_up back_down
Examples:

"The bully had to back down"

Related terms: withdraw withdrawal
2. [ verb ] remove oneself from an obligation
Synonyms: pull_out back_down bow_out chicken_out
Examples:

"He bowed out when he heard how much work was involved"

Related terms: retire resile pull_out
Similar spelling:   back_up