What is the origin of the idiom "red in the face" and when to use it?
The idiom "red in the face" has been in use since at least the 19th century, and it is believed to have originated from observations of people's facial color changes when experiencing strong emotions or exertion. This phrase can be applied to personal interactions, such as when someone is caught in a lie, publicly criticized, or experiencing humiliation.
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having a flushed complexion due to physical exertion