To die means for a living thing to stop living permanently, when its body can no longer work. It can also be used figuratively for the end or disappearance of something, like a custom or idea.
From Old Norse "deyja" meaning "to die," related to other Germanic words for death. It gradually replaced the Old English verb "sweltan" (to die).
Die is a tiny word carrying one of the biggest concepts humans face. Many cultures soften it with phrases like "pass away" or "no longer with us," showing how language tries to cushion emotional impact.
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