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half-jack

noun
  1. Southern African informal a flat pocket-sized bottle of alcohol
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Word Origin for half-jack

C20: jack, probably from C16 jack a leather-covered vessel, from Old French jaque, of uncertain origin
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