Christian term referring to Sunday as the day of worship and rest, or more broadly to the day of the Lord's return. In Jewish context, it can refer to the Sabbath (Saturday).
Christians gather at church on the Lord's Day.
The Lord's Day is observed as a day of rest.
Compound of 主 (しゅ, 'Lord') + の (possessive particle) + 日 (ひ, 'day'). A direct translation of the Christian concept 'the Lord's Day' (Greek kyriakē hēmera).