The phrase "grandfather clause" means having special exceptions or privileges based on previous set rules that newer people don't have to follow. Full definition
The so - called grandfather clause would soften the impact of the new law initially, although over time contracts would be subject to right - to - work. (cnbc.com)
Environmental advocates argued that the rules would amount to a permanent grandfather clause for the plants, allowing them to function indefinitely without having to reduce their pollution. (heatisonline.org)
Foundations, roofs, Septic fields combined with grandfather clauses can be expensive. (biggerpockets.com)