estaban agolpando
Imperfect progressiveellos/ellas/ustedesconjugation ofagolpar.

agolpar

El noble, temiendo que le oyeran los ocupantes de los trineos y carruajes que se estaban agolpando en el camino, le dio cien rublos para que se callara.
The noble, fearing that the occupants of the other carriages and sleighs that were queuing up might hear, gave him a hundred roubles to keep him quiet.
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