As a noun, back is the rear part of something, especially the human body behind the chest. As an adverb or adjective, it relates to returning to an earlier place, time, or position; as a verb, it means to move or support from behind.
From Old English “bæc,” meaning “back” or “rear,” related to words in other Germanic languages with the same sense. It has kept its core idea of “the rear side” for over a thousand years.
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