for old times' sake
If you do something for old times' sake, you do it in order to remember a happy time that you had in the past:
We should all meet up again - just for old times' sake.
"For old time sake"
: I overheard someone using this phrase earlier. What's the meaning of this phrase, and where does it originate from?
Does it mean more to you as "for old time's sake"? It should. It means, approximately, in memory of old times, or as a tribute to past times. Usually one can understand it as "for past times together," in which we shared some degree of comradeship or common experience. Its age and origin are unknown to me.