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English definition of “rush hour”

rush hour

noun [C, usually singular]    
one of the very busy times of the day on roads, trains, etc., in the morning when people are travelling to work and in the evening when people are going home: in the/during rush hour It takes twice as long to drive to work during rush hour. The rush hour traffic was slow.
(Definition of rush hour noun from the Cambridge Business English Dictionary © Cambridge University Press)
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