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for auld lang syne
In honor of old times. "Auld lang syne" is a Scottish phrase meaning "old long since." Come on, you're only in town for a few days—let's go to dinner for auld lang syne.
for auld lang synefor old times' sake.
The phrase literally means ‘for old long since’, and is the title and refrain of a song by Robert Burns ( 1788 ).
for auld lang syne/for old times' sake
In memory of the good old days; for nostalgic reasons. This expression today is invariably associated with the song Robert Burns allegedly took down from an old man’s singing in 1788. Presumably it began its life with an emphasis on remembering “auld acquaintance”—that is, old friends—which appeared about 1670 in a ballad by Francis Semphill and repeated a phrase that was already proverbial. The anglicized version, for old times’ sake, probably dates from the same period. Eric Partridge deemed both to be clichés by the mid-nineteenth century.