Also a slang term for an alcoholic drink - frequently of the refreshing variety.

More specifically, a hangover cure, as referenced in John Barleycorn below. I'd suggest either a screwdriver or a bloody mary as good choices, but YMMV. The theory goes that the body doesn't like to be suddenly deprived - anecdotal evidence suggests a small amount of alcohol would be beneficial. The antioxidants & fructose in orange juice won't do any harm, either.

From John Barleycorn

...I was suffering from the morning sickness of the steady, heavy drinker. What I needed was a pick-me-up, a bracer.

from The Road to Success in Informal English

bracer(n) :an alcoholic drink taken as a stimulant.