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The back of...

Posted by Laura on January 02, 2010 at 21:48

'The back of (4pm)'
Can anyone help!? This is driving my friend nuts :)Does anyone know where I can find out the origin of the phrase 'the back of 4pm'. I would say just after the hour, (4.05pm) my friend says it's just before (3.55pm) can anyone help clear this up please? Silly question but really curious as everyone has a different answer! Thanks for your help.