telecomm the cables that take a common route through an exchange building linking ranks of selectors
plastic housing used to conceal wires, etc; casing
the delivery of goods over long distances, esp by road vehicles to local distribution centres, from which deliveries and collections are made

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for trunking

Historical Examples of trunking