如果你爷爷看到你今天的所作所为，他一定会死不瞑目的。

[误] If your grandpa could see what you\'re doing now, he wouldn\'t have closed his eyes when he died.

[正] If your grandpa could see what you\'re doing now, he would turn over in his grave.

注：“死不瞑目”的意思是“死时尚存遗憾”或“灵魂得不到安息”。若将其直译出来西方人很可能感到费解，所以建议采取意译的方式。除了上面的译法，还可以用 die with everlasting regret 或 die discontent 等。