My back went out我扭到腰了
Back Rise Out后取消
back-out punch取消冲眼
back-out method原路后退法
Back-out planning恢复计划
back-out system补偿系统
back back out of收回
back-out t退火
Back-out Plan撤销计划
PHRASAL VERB（动词词组） If you back out, or if you back out of something, you decide not to do something that you previously agreed to do. 退出; 变卦
The Hungarians backed out of the project in 1989 on environmental grounds.
匈牙利人在1989年以环境问题为由退出了该项目。