Hi, SJD87! I'm extremely happy to welcome you here at the English Forums! Your idiom means that you don't believe something and you need proof for it in order to believe it.
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Madhulk Hi, SJD87! I'm extremely happy to welcome you here at the English Forums!
Your idiom means that you don't believe something
and you need proof for it in order to believe it.And I'm not whether it's common or not
but it dates from about 1880.
It's not terribly common, but older people (ahem!) are aware of the reference to be
SJD87Is this idiom commonly used in English?No.
SJD87What does it exactly mean?Show me! Prove it!