blue law
noun
1- N. Amer. a law prohibiting certain activities, such as shopping, on a Sunday〈北美〉蓝色法规（禁止在星期日从事购物等活动的法规）。
1.1
- (in colonial New England) a strict puritanical law, particularly one preventing entertainment or leisure activities on a Sunday蓝色法规（殖民地时代新英格兰苛刻的清教教规, 尤指禁止在星期日从事休闲活动的教规）。