grandfather clause

American  

noun

1. U.S. History. a clause in the constitutions of some Southern states after 1890 intended to permit white people to vote while disfranchising Black people: it exempted from new literacy and property qualifications for voting those men entitled to vote before 1867 and their lineal descendants.

2. any legal provision that exempts a business, class of persons, etc., from a new government regulation that would affect prior rights and privileges.

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grandfather clause British  

noun

1. history a clause in the constitutions of several Southern states that waived electoral literacy requirements for lineal descendants of people voting before 1867, thus ensuring the franchise for illiterate White people: declared unconstitutional in 1915

2. a clause in legislation that forbids or regulates an activity so that those engaged in it are exempted from the ban

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Etymology

Origin of grandfather clause

An Americanism dating back to 1895–1900