blue law

Noun

 * 1)  A restrictive religious-based law in colonial New England, especially preventing leisure activities on a Sunday.
 * 2)  By extension, any puritanical or restrictive law, especially one that prohibits or restricts commercial activity on a Sunday.
 * 3) *2001,, diary entry January 22, in Theft by Finding, Back Bay Books 2017, p. 441:
 * [I]t's actually a way around the Swiss blue laws demanding that shops close from Saturday afternoon until Monday morning. The laws apply everywhere but the airport, so they built a massive supermarket in the Swiss Air terminal.