rush hour Meaning in Cambridge American English Dictionary
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Meaning of "rush hour" - American English Dictionary

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rush hournoun [C]

 us   /ˈrʌʃ ˌoʊr/
one of the busy parts of the day, either when people are traveling to work in the morning or when they are traveling home from work in the evening: Take alternate routes during the morning rush hour.
(Definition of rush hour from the Cambridge Academic Content Dictionary © Cambridge University Press)
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