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Definition of Brown out
1. Noun. A reduction in illumination caused by a voltage reduction in an electrical power supply. ¹
2. Noun. Temporary dimming of vision, usually with a brown hue and accompanied by loss of peripheral vision or tunnel vision. ¹
3. Verb. To experience a partial loss of vision having the characteristics of a brownout, to suffer a brownout. ¹
¹ Source: wiktionary.com