One of the mysteries of the English language finally explained.
The obligation in the Roman Catholic Church of receiving the Holy Eucharist during the season of Easter; the act of fulfilling this obligation. Also in plural Frequently in "to make (also perform) one's Easter duty (or duties)".
Late 16th century (in an earlier sense). From Easter + duty.
Easter duty/ˈiːstə ˈdjuːti/
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