fall back

US /fɔːl bæk/
UK /fɔːl bæk/
"fall back" picture
1.

撤退, 后退

to retreat or move back

:
The troops were ordered to fall back to a more defensible position.
部队被命令撤退到更易防守的位置。
When the enemy advanced, our soldiers had to fall back.
当敌人进攻时,我们的士兵不得不撤退
2.

依靠, 求助于

to rely on someone or something for support or help when in difficulty

:
If things go wrong, we can always fall back on our savings.
如果出了问题,我们总可以依靠我们的积蓄。
She had to fall back on her emergency skills during the crisis.
在危机中,她不得不依靠她的应急技能。