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brown bagging

British  

noun

  1. the practice of eating one's lunch or drinking a bottle of alcohol from a brown bag

"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

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The letter ordered them to stop the practice of brown bagging on threat of fines or imprisonment for up to a year.

From Time Magazine Archive