英汉解释

退却，后退；[计]回落

同义词

v. dawdle，drop off，recede，recur

反义词

v.   advance，gain，gain ground，go on

参考例句

1. We charged and the enemy's front line fell back.
我们发起了冲锋，敌人的前线被迫后退。
2. In an emergency we can fall back on our savings.
在情况紧急时，我们可以依靠我们的积蓄。
3. If the first plan fails, we can fall back on the second.
如果第一计划失败了，我们还可以依靠第二个计划。

英英解释

n.
  1. to break off a military action with an enemy
  2. fall backwards and down
  3. hang (back) or fall (behind) in movement, progress, development, etc.
  4. move back and away from
  5. retreat
  6. have recourse to
  7. go back to bad behavior

网络释义

fall back
回落; 后退，退却; 退回; 后退,后撤;
fall-back mode
撤退[后退]方式;
Fall-Back Control
候补控制;
fall fall back on
求助于，依靠;
fall back on
求助于，转而依靠; 借助于，依靠; 求助于; 依靠，依赖;