Bog, subs. (prison).—1. The works at Dartmoor, on which convicts
labour; during recent years a large quantity of land has been reclaimed
in this way.
1877. Five Years’ Penal Servitude, ch. iii., p. 158. These were the
men destined for outdoor work, the bogs, as the places where the
different outside gangs worked were called [at Dartmoor].