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- Dictionarymood swing/ˈmo͞od ˌswiNG/
noun
- 1. an abrupt and apparently unaccountable change of mood.
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noun
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A mood swing is an extreme or sudden change of mood. Such changes can play a positive part in promoting problem solving and in producing flexible forward planning, or be disruptive. When mood swings are severe, they may be categorized as part of a mental illness, such as bipolar disorder, where erratic and disruptive mood swings are a defining feature. Wikipedia