A Scottish word meaning 'since' or 'then', often heard in the phrase 'auld lang syne' (days gone by).
From Scottish English, related to Old English 'sithence' and Scots 'sen', evolved as a dialectal form of 'since'.
Robert Burns used 'auld lang syne' in a 1788 poem that became the world's most-sung song at midnight on New Year's Eve—billions of people sing Scottish words they don't understand every January.
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