1. （为避免问题或冲突而）后退，避让，退缩
    If you back off, you move away in order to avoid problems or a fight.

2. 放弃，收回（主张、要求、承诺等）
    If you back off from a claim, demand, or commitment that you made earlier, or if you back off it, you withdraw it.

3. 别插手；别干涉
    If you tell someone to back off, you are telling them to stop interfering.

1. move backwards from a certain position

    e.g. The bully had to back down

    Synonym: back upback down

2. remove oneself from an obligation

    e.g. He bowed out when he heard how much work was involved

    Synonym: chicken outpull outback downbow out