(simile) Very ill.

Alternative form of sideshow

A place used as a hospital on board a ship, on a spaceship (in science fiction). / A room or area for the treatment of the sick or injured in a school.

(Canada, US) Used other than figuratively or idiomatically: see get, sick. / (euphemistic) To vomit.

(idiomatic) To feel irritable; to be in a bad mood; to have a bad day from the start, for no particular reason.

(Singapore, informal) get lost!

(felinology) A short-haired breed of domestic cat having blue eyes and pointed coat pattern, that is, a pale body and dark extremities.

(medicine) Altitude sickness.

Alternative spelling of sunny side up

A paid personal day intended to be used due to illness either for recuperation or medical treatment.