has been smoldering
Present perfect progressivehe/sheconjugation ofsmolder.

smolder

And now, suddenly, a real estate development project, a simple—although Pharaonic—development project has set the spark to powder, precipitating a revolt that has been smoldering in secret but had not yet found the adequate words or the courage to assert itself.
Y de pronto un proyecto inmobiliario, un simple —aunque faraónico— proyecto inmobiliario prende la mecha y desata una revuelta que se estaba incubando en secreto, pero que no había encontrado ni palabras para expresarse ni coraje para afirmarse.
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