1. brass neck - Noun
2. brass neck - Verb
(idiomatic, UK, Ireland) Gall, shamelessness, cheek.
(idiomatic, UK, Ireland) A person with gall.
brass-neck (third-person singular simple present brass-necks, present participle brass-necking, simple past and past participle brass-necked)
(idiomatic, UK, Ireland) To behave boldly or shamelessly.
brass-neck