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rockfall

[rok-fawl] /ˈrɒkˌfɔl/
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 of rockfall
1920-1925
1920-25; rock1 + fall
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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