rumination

noun
ru·​mi·​na·​tion | \ ˌrü-mə-ˈnā-shən How to pronounce rumination (audio) \

Medical Definition of rumination

: the act or process of ruminating:
a : the act or process of regurgitating and chewing again previously swallowed food
b : obsessive thinking about an idea, situation, or choice especially when it interferes with normal mental functioning specifically : a focusing of one's attention on negative or distressing thoughts or feelings that when excessive or prolonged may lead to or exacerbate an episode of depression

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a topic to which one constantly reverts

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