A day spent at home, ostensibly in bed, and sanctioned by one's employer/school, when one is feeling stressed or fragile.

plural of day sign

(idiomatic, intensifier, simile) Unceasingly; very; thoroughly; to a very high degree.

Alternative form of sea day

(slang, Australia, New Zealand) A very long time ago; as far back as one can remember.

(idiomatic) To set the standard which guides behavior; to control a situation, group, strategy, etc.

(fandom slang) April 26, as a "fan holiday" celebrating the science-fiction horror franchise "Aliens". The date 4/26 is in reference to fictional planet LV-426 where the Xenomorph was first unveiled.

Starting during daylight hours and continuing until after dark.

(Christianity) Synonym of Epiphany (“an annual Christian feast on the twelfth day after Christmas Day (6 January) celebrating the appearance of Jesus Christ to the Magi”).

(Australia) A public holiday held in Australia for the annual agricultural show in a state.