a simple restaurant, often with an open front, or a counter or booth where milk drinks, sandwiches, etc., are sold.
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British Dictionary definitions for milk bar
a snack bar at which milk drinks and light refreshments are served
(in Australia) a shop selling, in addition to milk, basic provisions and other items
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