die out
phrasal verbPart ofdie
die out — phrasal verb
1. to become less and less common and eventually cease to exist altogether — used f
1.phrasal verb
Definition
to become less and less common and eventually cease to exist altogether — used for species, customs, languages, or traditions.
Example
Many local dialects have died out as younger generations speak the national language.
The species of turtle is dying out because its natural habitat is disappearing.