process when a language loses its last native speaker
In linguistics, language death occurs when a language loses its last native speaker. By extension, language extinction is when the language is no longer known, including by second-language speakers, when it becomes known as an extinct language. A related term is linguicide, the forced death of a language.
The disappearance of a minor language as a result of the absorption or replacement by a major language is sometimes called "glottophagy".
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).