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countable and uncountable, plural sundowns
(US) Sunset. examples
(countable) A hat with a wide brim to shade the eyes from sunlight. examples
third-person singular simple present sundowns, present participle sundowning, simple past and past participle sundowned
(intransitive) to experience an episode or an onset of some detrimental mental condition like agitation, anxiety, hallucination or dementia, daily at nightfall. quotations examples
"She also “sundowned”, and someone had to keep an eye on her 24-7."
2009, Kay Cameron, Tim Rhodus, Life With God 101