estuvieron acumulando
-they/you were accumulating
Preterite progressiveellos/ellas/ustedesconjugation ofacumular.

acumular

El Estado, las corporaciones privadas y una gran parte de la población estuvieron acumulando deudas a un nivel sin precedentes.
The state, the private corporations and a large section of the population were building up debt on an unprecedented level.
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