Definition of grandfather verb from the Oxford Advanced American Dictionary

 

grandfather

 verb
verb
NAmE//ˈɡrænˌfɑðər//
 
Verb Forms present simple I / you / we / they grandfather he / she / it grandfathers past simple grandfathered -ing form grandfathering
 
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to give or be given official permission not to obey a new law or regulation that one would normally be required to obey grandfather somebody/something Workers who were here before the cut in benefits went into effect will be automatically grandfathered. grandfather somebody/something in Older cars have been grandfathered in and don’t have to have air bags.