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Mind your p's and q's

Posted by Sw on October 30, 2003

I had thought that this phrase came from WWII. When the UK and US were planning D-day, Churchill was Mr. P and Roosevelt was Dr. Q in code speak. Obviously secrecy was of the utmost importance, so the people involved would always say 'Mind your p's and q's'. Had anyone else heard this? Or am I confusing phrases?