fall back on something
— phrasal verb with fall us/fɔl/verb past tense fell /fel/, past participle fallen /ˈfɔ·lən/
to use something for help because no other choice is available:
The organization has no income and no reserves to fall back on.
英语词典包含110679条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。