The document discusses language shift, which is a change from using one language to using another, more dominant language. This often occurs among immigrant families and communities. The Coptic language in Egypt provides an example, declining after the Arab conquest in the 7th century. Today it survives only as the liturgical language of the Coptic Church. Language shift can be influenced by government policy, employment opportunities, and interaction with the dominant language in schools and media. It may take 3-4 generations for a community to fully shift languages. The ultimate outcome is language loss or death if a language is no longer spoken.