Meaning of rockfall

rock•fall

Pronunciation: (rok'fôl"), [key]
— n.
  1. an act or instance of the falling of rock, as in a cave-in or an avalanche.
  2. a mass of rocks that have fallen: to be trapped under a rockfall.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.