grandfather sb/sth into sth
phrasal verbwithgrandfatherverbLAWUSuk/ˈɡrænfɑːðər/us
(alsograndfather sb/sth in)toallowsomeone tocontinueto do or to have something that a newlaworrulemakesillegal:
Mostexistingcompanieswill be grandfathered into theoldsystemfor up to fiveyears.
Manyoldbridgeswillsuddenlybe out ofdatebut will be grandfathered in.