"Blue laws" refer to regulations that restrict or prohibit certain activities on Sundays or other religious rest days. These laws, which were originally intended to enforce religious observance and morality, have evolved to cover a wide range of activities such as alcohol sales, shopping, and even certain entertainment events. Synonyms for "blue laws" include Sunday laws, Sabbath laws, religious laws, and rest day laws. Some states in the US still have strict blue laws in place, while others have relaxed or eliminated them altogether. Regardless, the debate over blue laws often centers around individual rights and religious freedom.