fell back on

• vt. 求助于(回到 ... 上面来； 退守)

fell back on的用法和样例：

例句

1. At least we can fall back on candles if the electricity fails.
   停电时我们至少可以使用蜡烛。
2. Luckily she fell back on grass or she might have hurt her head.
   幸好她是向后倒在草地上，不然就会伤着头。