Meaning of “grandfather sb/sth into sth” in the English Dictionary

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"grandfather sb/sth into sth" in Business English

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grandfather sb/sth into sth

also grandfather sb/sth in
phrasal verb with grandfather uk /ˈɡrænfɑːðər/ us verb US LAW

to allow someone to continue to do or to have something that a new law or rule makes illegal:

Most existing companies will be grandfathered into the old system for up to five years.
Many old bridges will suddenly be out of date but will be grandfathered in.

(Definition of “grandfather sb/sth into sth” from the Cambridge Business English Dictionary © Cambridge University Press)