thick blue line
n.— «A new report from the national police academy points to such a lack of intellectual rigour among new recruits that the force is now unflatteringly being referred to as New Zealand’s “thick blue line.”» —“NZ police labelled ‘thick blue line’” by Peter Lewis in New Zealand ABC News (Australia) June 27, 2007. (source: Double-Tongued Dictionary)
Further reading
A firefighter named Steve in Newport News, Virginia, wonders why in his line of work, and for some police, certain additional kinds of days off after long unbroken shifts are called Kelly days, Kelly shifts, or Kelly time. The term most likely comes...
In Greek myth, the sirens were women with the bodies of birds whose song was so alluring that it enticed men to their death. In the early 19th century, French engineer and physicist Charles Cagniard de la Tour built a device that sent blasts of air...