To turn a brass color.
Generally followed by out or through: to carry through in a brazen manner; to act boldly despite embarrassment, risk, etc.
Pertaining to, made of, or resembling brass (in color or strength).
Sounding harsh and loud, like brass cymbals or brass instruments.
Extremely strong; impenetrable; resolute.
Shamelessly shocking and offensive; audacious; impudent; barefaced; immodest, unblushing.
She was brazen enough to deny stealing the handbag even though she was caught on closed-circuit television doing so.