What is the origin of the idiom "black eye" and when to use it?
The idiom "black eye" has its origins in the literal physical injury of the same name, which is a swollen and discolored bruise around the eye caused by a blow or impact. This expression dates back to at least the 19th century and is used to describe a visible bruise or injury around the eye caused by physical trauma.
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occhio nero
an unfortunate happening that hinders or impedes; something that is thwarting or frustrating