09-10-2017, 08:54 AM
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Senior Member
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Join Date: Feb 2004
Posts: 54,198
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At local taverns, pubs, and bars, people drank from pint and quart-sized containers. A bar maid's job was to keep an eye on the customers and keep the drinks coming. She had to pay close attention and remember who was drinking in 'pints' and who was drinking in 'quarts,' hence the phrase 'minding your 'P's and Q's'.
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