Meaning of day rule in English:

day rule

Pronunciation /ˈdeɪ ruːl/

noun

historical Law
  • A rule or order of court, authorizing a prisoner to leave prison for one day.

    Used especially with reference to debtors held in the Fleet and King's Bench prisons in London. The practice was abolished in 1842.

Origin

Late 17th century; earliest use found in General Considerations Bill regulating Abuses of Prisons. From day + rule.