It all depends on the context. but most of the time, it means over, surpass,exceed, go further than, above and beyond. We can use comparative form to express it. e.g.She stopped drinking the tea at once, and has since regained the seven pounds she lost, and more.她立刻停止服用瘦身茶，打那以后她瘦掉的7磅肉又长回来了，甚至有过之还无不及。 Japanese products are now known for their superior quality that rival, and in many cases, even exceed the best that the Western manufacturers can offer. 众所周知，日本产品现在已经能和西方最强的对手一较高低，很多甚至有过之而无不及。