n. (澳)无业游民, (非正式)日落时喝的饮料, (非正式)执行纪律严格者

Sundowner \Sun"down`er\, n.
A tramp or vagabond in the Australian bush; -- so called from
his coming to sheep stations at sunset of ask for supper and
a bed, when it is too late to work; -- called also {traveler}
and {swagman} (but not all swagmen are sundowners).

Sundowners, -- men who loaf about till sunset, and then
come in with the demand for unrefusable rations.
--Francis
Adams.
[Webster 1913 Suppl.]