show up相当于appear，也可以表示“使了解真相，揭露”

show up:（使）清晰，（使）显现；（使）难堪。

用法：

1.（使）清晰，（使）显现：You didn't show up at the meeting.你没有来开会。

The truth began to show up.真想渐渐浮出水面。

2.（使）难堪：You've shown me up.你让我难堪了。