Generally followed by out or through: to carry through in a brazen manner; to act boldly despite embarrassment, risk, etc.
To turn a brass color.
Shamelessly shocking and offensive; audacious; impudent; barefaced; immodest, unblushing.
Sounding harsh and loud, like brass cymbals or brass instruments.
Obsequious, flattering, toadying. In other words, eager to please.