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Rocky Mountain locust

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noun
a migratory locust, Melanoplus spretus, that occurs in North America, especially the Great Plains, where swarms cause great damage to crops and other vegetation.
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Also called Rocky Mountain grasshopper.

Origin of Rocky Mountain locust

An Americanism dating back to 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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