75 entries under expression topic. ×

5
no more(adjective, idiom, split, lifeless)
5
out of date(adjective, idiom)
3
gone by(verb, adjective, phrasal verb, dead)
3
no longer existing
2
at rest(adjective, idiom, live)
2
behind the times(idiom, odd, old, primitive)
2
of old(dead, odd, old, past)
2
out of style(idiom, odd, old, primitive)
1
down the drain(idiom, split, lacking, finished)
1
burned up(split, away, lacking, finished)
1
dead and buried
1
dead and gone(adjective, idiom, dead, death)
1
dead as nits(idiom, death)
1
die out(verb, phrasal verb, inexistence)
1
died out(adjective, missing, nonexistent, vanished)
1
down memory lane(adjective, idiom, dead, past)
1
dried up(split, away, lacking, finished)
1
grown old(odd, old, primitive, unfashionable)
1
in oblivion(adjective, dead, past, lost)
1
lost to sight
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APASmart Define. (2016). extinct thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/extinct/thesaurus/synonyms
ChicagoSmart Define. 2016. "extinct thesaurus" https://smartdefine.org/extinct/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, extinct thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/extinct/thesaurus/synonyms>.
MLASmart Define. "extinct thesaurus" 10 February 2016. Web. 20 September 2026. <https://smartdefine.org/extinct/thesaurus/synonyms>