sun + down
sundown (countable and uncountable, plural sundowns)
- (US) sunset
- We'll meet by the pier at sundown; don't forget to bring your kazoo.
sundown (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
- 2009, Kay Cameron, Tim Rhodus, Life With God 101
- "She also “sundowned”, and someone had to keep an eye on her 24-7."