fall back on [fɔ:l bæk ɔn]

以下由轻松背单词网站提供

求助于，转而依靠

The enemy had to fall back on the second line of defense.敌人不得不退到第二道防线。
In an emergence we can fall back on our savings.紧急时刻，我们总可以依靠我们的储蓄。