fall back
move or turn back; retreat 後退; 撤退; 退却
The enemy fell back as our troops advanced. 我军前进, 敌军後退. fall back on sb/sth (be able to) go to sb for support or use sth when in difficulty 有困难时(能)求助於某人, 依靠某事物
At least we can fall back on candles if the electricity fails. 停电时我们至少可以使用蜡烛.
She´s completely homeless at least I have my parents to fall back on. 她是真正无家可归--我至少有父母可依靠.