"挟洋自重"用英语怎么说？

不好翻容易丢味~~
本意是依靠外国人势力抬高自己或大造声势，
有崇洋媚外之意

根据这个意思翻下
给你几个
worship everything foreign
崇洋媚外或者（worship foreign things and fawn on foreign powers）
还有foreign moon is better
外国的月亮圆

挟洋自重 : Pinches the foreign dead weight

relying on foreign forces

taking advantage of his/her connection with foreign forces