Example: "His gambling cost him a fortune"
To gamble.
To play card games, board games, or video games.
To exploit loopholes in a system or bureaucracy in a way which defeats or nullifies the spirit of the rules in effect, usually to obtain a result which otherwise would be unobtainable.
Example: "We'll bury them in paperwork, and game the system."
(of males) to perform premeditated seduction strategy.