Q – Why do we talk ‘nineteen to the dozen’?
A – A very literal saying: using nineteen words where twelve will do. So, speaking fast or endlessly (or both). There doesn’t seem to be any particular reason why nineteen should have been chosen, but the phrase has been round for many years, appearing as early as 1785 in Sheridan’s Journal: ‘The Mother good humour’d and Civil, but talks nineteen to the dozen.’
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Many happy returns of the day.