Function: transitive verb
Date: 1826
1 : to expose or discredit especially by revealing faults < showed them up as frauds>
2 : to embarrass or cause to look bad especially by comparison <trying to show up the boss>
3 : REVEAL < showed up my ignorance>
intransitive verb
1 : ARRIVE , APPEAR < showed up late for his own wedding>
2 : to be plainly evident