1. (verb) gather into a huge mass and roll down a mountain, of snow

• roll down

1. (noun) a slide of large masses of snow and ice and mud down a mountain

• slide

2. (noun) a sudden appearance of an overwhelming number of things

• happening
• natural event
• occurrence
• occurrent

3. (verb) gather into a huge mass and roll down a mountain, of snow

• come down
• descend
• fall
• go down

1. (noun) a slide of large masses of snow and ice and mud down a mountain

• lahar

1. (noun) a slide of large masses of snow and ice and mud down a mountain

• roll down