blue law
noun /ˈbluː lɔː/
/ˈbluː lɔː/
[usually plural]- (in the US) a law that bans business and certain other activities, such as sports, on Sundays
蓝色法规（美国法规，禁止星期天从事商业和体育运动等活动） CultureBlue laws were first introduced in colonial New England and were originally printed on blue paper. Now they vary widely in different parts of the US. Although many shops open on Sundays, they often do not sell alcohol on that day because of a blue law.