Each of the three days preceding Ascension Day (Holy Thursday), during which religious processions take place; a Rogation Day. Chiefly in plural Compare Gang Week.
Origin
Old English. From gang + day, so called on account of the processions held on these days.
Definition of Gang Day in US English:
Gang Day
nounˈɡaŋ deɪ
historical
Each of the three days preceding Ascension Day (Holy Thursday), during which religious processions take place; a Rogation Day. Chiefly in plural Compare Gang Week.
Origin
Old English. From gang + day, so called on account of the processions held on these days.