knock sb for six – to shock or upset someone very much, or to make someone very ill

一击得最高分(6分) - 使某人大吃一惊，给某人以沉重打击或者让某人感到十分难受

例句：

Jenny has just announced that she's leaving which has knocked me for six. I really enjoyed working with her. (Ball games)

珍妮刚刚宣布了她要离开的事，这让我感到十分震惊。我真的很喜欢和她共事。（球类运动）