名詞 fall back:

1. to break off a military action with an enemy
   同義詞：disengagement, fallback, pullout

動詞 fall back:

1. fall backwards and down
2. hang (back) or fall (behind) in movement, progress, development, etc.
   同義詞：lag, dawdle, fall behind
3. move back and away from
   同義詞：recede, retire
4. retreat
   同義詞：lose, drop off, fall behind, recede
5. have recourse to
   同義詞：resort, recur
6. go back to bad behavior
   同義詞：relapse, lapse, recidivate, regress, retrogress

1. She's completely homeless at least I have my parents to fall back on.
   她是真正無家可歸--我至少有父母可依靠。
2. It's always useful to have something to fall back on.
   有點依靠的東西總是有用的。
3. At least we can fall back on candles if the electricity fails.
   停電時我們至少可以使用蠟燭。
4. The enemy fell back as our troops advanced.
   我軍前進，敵軍後退。