Definition of sundowners:
(n) :
(originally colonial slang, especially southern Africa) A cocktail consumed at sunset, or to signify the end of the day.
(n) :
A cocktail party held in the early evening.
(n) :
(medicine, colloquial) A patient, usually demented, who tends to become agitated in the evening.
(n) :
(nautical) A sea captain who shows harsh discipline by requiring all hands to be on board by sundown.
(n) :
A physician employed by the government who practises for private fees after his official hours.
(n) :
Any worker who practises for private fees after official hours.