1.
If something shows up or if something shows it up , it can be clearly seen or noticed.
You may have some strange disease that may not show up for 10 or 15 years...
...a telescope so powerful that it can show up galaxies billions of light years away...
PHRASAL VERB : V P , V P n (not pron)
2.
If someone or something shows you up , they make you feel embarrassed or ashamed of them.
He wanted to teach her a lesson for showing him up in front of Leonov...
PHRASAL VERB : V n P
3.
see show 12