rush hour

noun
a time of day in which large numbers of people are in transit, as going to or returning from work, and that is characterized by particularly heavy traffic.

Origin:
1895–1900

rush-hour, adjective
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World English Dictionary
rush hour
 
n
a period at the beginning and end of the working day when large numbers of people are travelling to or from work

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
During rush hour, maddening traffic jams can arise without an obvious cause.
In some places, a small toll at rush hour and a few buses will be enough to
  keep traffic running smoothly indefinitely.
Crews anticipate work to be completed by the peak rush hour afternoon traffic.
Significant traffic delays are expected during the afternoon rush hour.
Synonyms
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