stand down基本解释
放弃席位; 解除戒备状态，恢复正常执勤
stand down词典解释
1. (从重要职位上)退下，下台(常为了让位给别人)
If someone stands down, they resign from an important job or position, often in order to let someone else take their place.
e.g. Four days later, the despised leader finally stood down, just 17 days after taking office...
4天后，这位遭到鄙视的领导人终于下台了，离他就职只有 17 天。
e.g. Profits plunged and he stood down as chairman last January.
因利润骤降，他作为董事长于去年 1 月辞职了。