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bold as brass
*bold as brass
very bold; bold to the point of rudeness. (*Also: as ~.) Lisa marched into the manager's office, bold as brass, and demanded her money back. The tiny kitten, as bold as brass, began eating the dog's food right under the dog's nose.
bold as brass
Shameless, audacious, impudent. For example, No one had invited her to the wedding, but she showed up at the church, bold as brass. This alliterative simile plays on brass meaning "shamelessness." [c. 1700]