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

Equine dysautonomia: a rare but predominantly fatal polyneuropathy in horses and donkeys.

(collectible card games, originally and chiefly Magic: The Gathering) The inability of a creature to attack or use certain abilities during the turn when it comes into play.

(colloquial) Utterly sick of something; entirely fed up; used with of.

morning sickness

(often derogatory) Literature focusing on an ill character or characters.

To become ill; to fall ill.