show up phrasal verb ( see also ↑ show )
1 . informal to arrive, especially at the place where someone is waiting for you SYN turn up :
Seth showed up, apologising for being late.
We had 200 people show up for our seminar.
2 . show something ↔ up to make it possible to see or notice something that was not clear before:
The sunlight showed up the marks on the window.
3 . to be easy to see or notice:
Use a light colour which will show up on a dark background.
4 . show somebody ↔ up to make someone feel embarrassed by behaving in a stupid or unacceptable way when you are with them SYN embarrass :
She says I showed her up in front of her friends when they came to the house.