柯林斯詞典back out (backing,backed,backs) 1. PHRASAL VERB If you back out, or if you back out of something, you decide not to do something that you previously agreed to do. 退出; 變卦 The Hungarians backed out of the project in 1989 on environmental grounds. 匈牙利人在1989年以環(huán)境問(wèn)題為由退出了該項(xiàng)目。 返回 back out