(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.

(medicine) A disease characterized by sickle-shaped red blood cells.

(Canada, US) A disease characterized by sickle-shaped red blood cells.

(sports, billiards, snooker, pool) A sidespin of the cue ball which makes it bounce off the cush, or off another ball, at a shallower angle than normal.