It is a waste of time to try to revive interest in a worn-out or forgotten
subject, or to argue about something that was settled long since.

> ‘I said it at the time and I say it again that when they built the new
bypass they should have taken it round the north of the town, not round the
south.’

> ‘Why bring that up again? Nothing can be done about it now. You’re flogging
a dead horse.’

##### See also:

* Harp not for ever on the same string