Definition of passion day in English:

passion day

noun

Christian Church
rare
  • Originally: a day on which a Christian martyr suffered death, or on which the martyr's sufferings are commemorated. Later: (in extended use) of non-Christian martyrs.

Origin

Early 17th century (in an earlier sense). From passion + day.

Pronunciation

passion day

/ˈpaʃn deɪ/