Ring of Truth
Meaning
To be correct, to be true.
Example
I believe some of what Paul Martin says, but the part about reducing taxes doesn’t seem to have even the slightest ring of truth to it.
Origin
The origin of this phrase becomes obvious when you realize the original usage was to say that something did or did not ring true.
A bell that rings true is one the rings at the correct note. Something that rings true is correct.
