show up

show up  {v.}

1. To make known the real truth about (someone).

The man said he was a mind reader, but he was shown up as a fake.

2. To come or bring out; become or make easy to see.

The detective put a chemical on the paper, and the fingertips showed up.

This test shows up your weaknesses in arithmetic.

3.  {informal}

To come; appear.

We had agreed to meet at the gym, but Larry didn't show up.

Only five students showed up for the class meeting.

Compare: TURN UP (2).