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1. to be a sport
2. to go along and do what you are supposed to
From Reservoir Dogs :

(talking about tipping and the fact that tips are taxed)

Mr Pink: (...) Look, if you show me a piece of paper that says the government shouldn't do that, I'll sign it, put it to a vote, I'll vote for it, but what I won't do is play ball. (...)

Meaning he will not do like everyone and start tipping waitresses.
by BelgianTake March 09, 2012
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