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Phrase(s): die a natural death
1. Lit. [for someone] to die by disease or old age rather than by violence or foul play. • I hope to live to 100 and die a natural death. • The police say she didn’t die a natural death, and they are investigating. 2. Fig. [for something] to fade away or die down. • I expect that all this excitement about the scandal will die a natural death. • Most fads die a natural death.
McGrawhill's American Idioms And Phrasal Verbs