decay, decline, deteriorate, fester, go to seed, idle, languish, lie fallow, rot, rust, stand still, vegetate
English Collins Dictionary - English synonyms & Thesaurus
stagnate ( stagnates 3rd person present) ( stagnating present participle) ( stagnated past tense & past participle ) If something such as a business or society stagnates, it stops changing or progressing. verb
Industrial production is stagnating... V
...the stagnation of the steel industry.
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