●ˌfall ˈback on sb/sth ( ˌfall ˈback upon sb/sthmore formal) to use sb/sth when the situation is difficult or other people/things have failed求助于；借助于；转而依靠◆It’s very hard if you have no family to fall back on. 没有家人可依靠的话，生活会十分艰难。◆He could always fall back on his old jokes. 他总会搬出他那些老掉牙的笑话。[v + adv + prep]▸ˈfallback
noun
a plan or course of action that you can use if sth else fails应变计划；退路◆a fallback position 应变方案