slang. Food; spec. the commons of bread at Christs Hospital.
The original meaning may be crust, in which sense it is used at Christs Hospital School, Hertford.
1820. Lamb, Elia, Ser. I. Christs Hospital. We were battening upon our quarter of a penny loafour crugmoistened with attenuated small beer.
1873. Slang Dict., Crug, food. Christs Hospital boys apply it only to bread.