The use of the word "long" to refer to a person's height is thought to have originated from the Old English word "lang," which meant "tall" or "tall in stature." This usage of the word has been around for several centuries, and has evolved to become a common way of referring to someone's height in informal or colloquial contexts. It is believed that this usage of the word may have originated from the idea of "stretching out" or being "stretched out," which would describe someone who is tall. However, this is just a theory, as the exact origins of the word "long" as a reference to height are not well documented.
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