1. phrasal verb. If something dies out, it becomes less and less common and eventually disappears completely.

What does dye out mean?

Meaning of die out in English to become less common and finally stop existing: Dinosaurs died out millions of years ago. It’s a custom that is beginning to die out.

How do you spell die out?

“Die out.” Merriam-Webster.com Dictionary, Merriam-Webster, 20out.