No longer alive; not functioning or working; also used for things that are completely still, quiet, or finished.
From Old English 'dēad', from Proto-Germanic '*daudaz'. It is an ancient word shared in similar forms across many related languages.
Because 'dead' is so old, it has grown many extra meanings—dead battery, dead quiet, dead end. We use it whenever we want to say that energy, life, or movement has completely stopped.
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