The phrase "aggressive stance" means behaving or expressing oneself in a forceful, confrontational, or assertive manner rather than being passive. Full definition
The city comptroller is taking a more aggressive stance on the controversial police shooting than his fellow mayoral candidates. (nymag.com)
What's more, some municipalities have taken a very aggressive stance on pricing. (ecommercetimes.com)
In turn, it allows the vehicle much better cornering performance, quickly adjustable ride height, and a much more aggressive stance as well. (bmwblog.com)