1. A fall or slide of a large mass, as of snow or rock, down a mountainside.
2. A massive or overwhelming amount; a flood: received an avalanche of mail.
3. to fall or slide in a massive or overwhelming amount.
4. to overwhelm; inundate.

1. A large mass or body of snow and ice sliding swiftly down a mountain side, or falling down a precipice.
2. A fall of earth, rocks, etc., similar to that of an avalanche of snow or ice.
3. A sudden, great, or irresistible descent or influx of anything.
4. anything like an avalanche in suddenness and overwhelming quantity (like a barrage, blitz, etc).
5. to descend like an avalanche.
6. to come down upon; to overwhelm.

1. A large mass or body of snow and ice sliding swiftly down a mountain side, or falling down a precipice.
2. A fall of earth, rocks, etc., similar to that of an avalanche of snow or ice.
3. A sudden, great, or irresistible descent or influx of anything.

1. the fall or sliding down of a mass of snow or ice from a mountain-slope.
2.

1. a slide of large masses of snow and ice and mud down a mountain
2. gather into a huge mass and roll down a mountain, of snow
3. a sudden appearance of an overwhelming number of things