rockfall

[rok-fawl]
noun
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.

Origin:
1920–25; rock1 + fall

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The rockfall buried dozens, perhaps hundreds, of residents alive.
Even though some of the rockfall was dynamited away, allowing the river to flow
  once more, the lake remained.
In addition to risking a fall, people who cut trails often kick off rockfall
  dangerous to those below.
Rockfall reports from the regions will be incorporated into the database.
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