rift : Idioms & Phrases
great rift valley
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noun ( geology) a depression in southwestern Asia and eastern Africa; extends from the valley of the Jordan River to Mozambique; marked by geological faults
WordNet
rift valley
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noun a valley with steep sides; formed by a rift in the earth's crust
WordNet
rift valley fever
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noun an infection common in Africa caused by a bunyavirus; transmitted by mosquitoes or by handling infected animals