a usage criticized by people who consider themselves 'guardians of' proper English
After the death of her parents, her uncle was appointed as her legal 'guardian'.
The historical society sees itself as the 'guardian of' the town's traditions.
(..) I think some adult guidance, supervision... could benefit you too, young lady. Because you have no legal guardian-- Is that right? Yes. And because you appear to be the most culpable of the defendants... and have a previous record... (..)1996 Foxfire