85 entries under decline topic. ×

1
fade away(expression, break, collapse, split)
1
fall apart(expression, weaken, degenerate, deteriorate)
1
go bad(verb, expression, idiom, deteriorate)
1
go from bad to worse(verb, expression, idiom, annoy)
1
go to pieces(expression, idiom, degenerate, deteriorate)
1
go to seed(verb, expression, idiom, fail)
1
go to the dogs(verb, expression, idiom, drop)
1
hit the skids(verb, expression, idiom, drop)
1
lose it(expression, weaken, degenerate, deteriorate)
1
lose quality(expression, weaken, degenerate, deteriorate)
1
lose value(verb, expression, drop, fall)
1
mar(verb, fail, damage, lower)
1
molder(break, sink, degenerate, deteriorate)
1
perish(verb, break, drop, give)
1
pollute(verb, weaken, impair, deteriorate)
1
recede(verb, drop, fall, fail)
1
skid(weaken, degenerate, deteriorate, decay)
1
take a turn for the worse(verb, expression, idiom, degenerate)
1
undermine(verb, fail, damage, lower)
1
vex(verb, light, disturb, annoy)
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APASmart Define. (2015). worsen thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/worsen/thesaurus/synonyms
ChicagoSmart Define. 2015. "worsen thesaurus" https://smartdefine.org/worsen/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, worsen thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/worsen/thesaurus/synonyms>.
MLASmart Define. "worsen thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/worsen/thesaurus/synonyms>