Definition: SDXBlue refers to a mysterious, dark cloud, often seen in the sky, which has been described as "blue" but could also be a metaphor for a state of mind or something that seems to remain unappealing or indecisive. The term was first used in 1907 by astronomer Henry B. Seward and is typically used to describe conditions that are difficult to overcome, such as a dark cloud blocking sunlight or a lack of clarity. The word "blue" refers to the shade of darkness that it creates, as in "sundown" or "dark blue." The term "SDXBlue" could also be used to refer to something that is cloudy or dull, just like in the sky with clouds.
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