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1 definition by spiritussancto

someone who is negatively affected by the sun going down. often refers to people with Alzheimer disease or other mental illnesses losing control at night.
"you could have warned me that old lady was a sundowner! 7pm hits and she starts trying to lick all the nurses"
"i'm ok during the day but as soon as night hits i feel crazy and horrible. i'm such a sundowner"
by spiritussancto May 10, 2010
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