Definition of crown day in US English:

crown day

noun

  • 1A day on which a king, emperor, or pope is present in person, wearing his crown (now historical).

  • 2(In Ireland) a Quarter Sessions day set aside for criminal cases, appeals, and some civil cases such as licensing applications.

Origin

Early 17th century; earliest use found in Thomas Heywood (c1573–1641), playwright and poet.