rat line
n.— «The British troops will be supported by US helicopters and unmanned reconnaissance drones which will scan the desert looking for tracks indicating “rat lines”—military jargon for the routes used by the resistance to transport fighters, arms and money.» —“Shells Land Near Black Watch Base” by Richard Lloyd Parry in Basra, Iraq Scotsman (Scotland) Oct. 31, 2004. (source: Double-Tongued Dictionary)
Further reading
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