fell back upon

fell back upon [fel bæk əˈpɔn]  [fɛl bæk əˈpɑn] 

fell back upon 基本解释
依靠,退守;
fell back upon 网络解释

fell back upon

1. 依靠:fell back on 依靠 | fell back upon 依靠 | fell back 后退