Brass Neck Meaning

(idiomatic, Britain, Ireland) A person with gall.

Example:   
2014 March 18, John Hyde, “Help for Heroes? Not from this government”[1], The Law Society Gazette, archived from the original on 20 March 2014:
  This year's commemorations of the start of World War One are a stark reminder of the sacrifices politicians make with other people's lives â€“ except nowadays they'll do so wearing a Help for Heroes t-shirt (almost entirely covering their brass necks). When it comes to the hypocritical lauding of the armed forces while simultaneously shafting them, no one does it better than this government.