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2.
competing in a league that is above yours in skill level.
When 10-year-old plays baseball in a league for 12-year-olds he is playing up.
by Statsclimber September 22, 2010
 
1.
1. If something isn't working right....

2. To be cheating on your other half
1.AWW my cars playing up it won't start!

2.See that guy Bob...He's playing up on his wife...
by shaktisaurfang September 12, 2010