A large mass or body of snow and ice sliding swiftly down a mountain side, or falling down a precipice.

A fall of earth, rocks, etc., similar to that of an avalanche of snow or ice.

(by extension) A sudden, great, or irresistible descent or influx; anything like an avalanche in suddenness and overwhelming quantity.

To descend like an avalanche.

To come down upon; to overwhelm.

"The shelf broke and the boxes avalanched the workers."

To propel downward like an avalanche.