slang. Food; spec. the commons of bread at Christ’s Hospital.

1

  The original meaning may be ‘crust,’ in which sense it is used at Christ’s Hospital School, Hertford.

2

1820.  Lamb, Elia, Ser. I. Christ’s Hospital. We were battening upon our quarter of a penny loaf—our crug—moistened with attenuated small beer.

3

1873.  Slang Dict., Crug, food. Christ’s Hospital boys apply it only to bread.

4