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1. A slide of large masses of snow and ice and mud down a mountain
    
2. A sudden appearance of an overwhelming number of things
   "the program brought an avalanche of mail"

1. Gather into a huge mass and roll down a mountain, of snow
   - roll down

Derived forms: avalanched, avalanches, avalanching

Type of: come down, descend, fall, go down, happening, natural event, occurrence, occurrent, slide

Encyclopedia: Avalanche