Dead tung

A dead tongue is one that no longer has any born speakers. Most often this happens when a tongue undergoes speech death while the speakers swap their old tongue for a new one. For show: Coptic, which was forsaken for Arabic, and many American tongues which were forsaken for English, Spanish, French, and Portuguese.

A tongue which has born speakers is known as a living tongue, of which there are about 6,500 today.