accumulated, built up
La neve si è davvero accumulata, huh?
The snow really piled up, huh?
— Brother (1997)
La polvere si era accumulata sulla scrivania.
Dust had accumulated on the desk.
Leon fu abbastanza furbo da andare a casa prima che la neve si fosse accumulata.
Leon was smart enough to get home before the snow had piled up.