fall back on something
phrasal verb with fall verb uk/fɔːl/ us/fɑːl/ fell | fallen
C2 借助于;依赖，依靠
to use something, especially a form of financial support, when other things have failed
When the business failed, we had to fall back on our savings. 公司倒闭后，我们只得靠积蓄度日。
If I lose my job, I'll have nothing to fall back on. 我要是丢了工作，就什么指望都没有了。