quality:corruption
Consequences on grammar

During language loss—sometimes referred to as obsolescence in the linguistic literature—the language that is being lost generally undergoes changes as speakers make their language more similar to the language to which they are shifting. This process of change has been described by Appel (1983) in two categories, though they are not mutually exclusive. Often speakers replace elements of their own language with something from the language they are shifting toward. Also, if their heritage language has an element that the new language does not, speakers may drop it.