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Definition of avalanche noun from the Oxford Advanced Learner's Dictionary

avalanche

noun
 
/ˈævəlɑːnʃ/
 
/ˈævəlæntʃ/
(North American English also snowslide)
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  1. a mass of snow, ice and rock that falls down the side of a mountain
    • alpine villages destroyed in an avalanche
    • He was killed in an avalanche while skiing.
    • (figurative) We received an avalanche of applications in reply to our advertisement.
    Extra Examples
    • (figurative) The issue has generated an avalanche of controversy.
    • (figurative) the avalanche of lawlessness threatening to engulf our civilization
    Topics Weatherb2, The environmentb2, Geographyb2
    Word Originlate 18th cent.: from French, alteration of the Alpine dialect word lavanche (of unknown origin), influenced by avaler ‘descend’; compare with Italian valanga.
See avalanche in the Oxford Advanced American Dictionary

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