Like most fads, this one eventually died out.像大部分流行风尚一样，这个最后也日渐销声匿迹。

The disease gradually died out over the last two generations.这种疾病在上两代人那里逐渐消失了。

Many more species are expected to die out completely [=to become extinct] unless we do something to help.除非我们伸出援手，否则估计会有更多的物种行将灭绝。