To inform one's workplace or school that one temporarily cannot attend work or school due to illness.

Any of several viral diseases of horses

Alternative form of sick-ass

Mentally disturbed or unsound; malevolently crazy. / Impressive.

plural of sick-wagon

(historical) a covered wagon used to convey or transport those who are sick in a wagon train / (dated) a vehicle used to convey or transport those who are sick or injured

galled with much riding

(UK, formerly) A benefit society that looked after its members when sick and made provision for their funerals.

plural of sick club

fainting or similar discomfort as a result of acupuncture