Grandfather clause meaning

What does the saying 'Grandfather clause' mean?

Idiom: Grandfather clause

Meaning:

An existing condition, usually in a contract or other agreement, that cannot be changed, even if the conditions are changed for others.

Country: International English | Subject Area: Men & women | Usage Type: Both or All Words Used
All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.
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