a stopped clock is right twice a day

Proverb.  A normally unreliable person or instrument can occasionally provide correct information, even if only by accident.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.