die out

present singular third person dies out · participle present dying out · participle past died out · past died out

1. idiomaticTo become extinct.

   The dinosaurs died out a long time ago.

   2 more examples

   The original family who had begun to build a palace to rival Nonesuch had died out before they had put up little more than the gateway,[…].

   1963, Margery Allingham, chapter 1, in The China Governess: A Mystery, London: Chatto & Windus, →OCLC

   Shepard: I thought you always needed another species to serve as one of the parents. Liara: Think about it, Shepard. If we were not able to mate with our own species, we would have died out long before we ever mastered space flight and left our homeworld.

   2008, BioWare, Mass Effect (Science Fiction), Redwood City: Electronic Arts, →ISBN, →OCLC, PC, scene: Med Bay Lab, SSV Normandy

   Synonyms: die off

2. idiomaticTo cease gradually.

   The prejudice has died out.

   1 more example

   However, apart from all this, the Chief was a grand old man, belonging to a class of individualists which seems to be dying out in these days, when standard behaviour seems to be as prevalent as standard designs.

   1945 January and February, A Former Pupil, “Some Memories of Crewe Works—III”, in Railway Magazine, page 14