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The idiom "black and blue" refers to a person who is bruised or beaten badly, often due to physical abuse or injury. It can also be used figuratively to describe someone who has gone through a difficult or unpleasant experience.
The idiom "black and blue" dates back to at least the 18th century, with early uses appearing in literature and poetry. It's believed to have originated from the color of bruises or injuries that turn into large patches of black and blue on the skin. Over time, the phrase has taken on a figurative meaning to describe someone who is feeling down or upset.