From Longman Dictionary of Contemporary Englishrush hourˈrush hour ●●○ noun [countable, uncountable] TTRBUSY PLACEthe time of day when the roads, buses, trains etc are most full, because people are travelling to or from work I got caught in the morning rush hour. heavy rush hour traffic
Examples from the Corpus
rush hour• Which is hard to believe at rush hour.• That concentration, greater than on a highway during rush hour, would not cause even a headache in most healthy people.• Service is frequent, with trains running every 7 { minutes during rush hour and once every 30 minutes on Sundays.• Like traffic caught in rush hour, freeway construction moves glacially -- especially when well-organized locals try to spike it.• In rush hour, forget it.• The law states the owners would have to put in a ferry, an interesting thought for the rush hour.• Peter suggested keeping on until half an hour into the rush hour but no longer as it looked like being particularly crowded today.From Longman Business Dictionaryrush hourˈrush hour noun [countable, uncountable] the time of day when the roads, buses, trains etc are most crowded, because people are travelling to or from workI try not to travel at rush hour.heavy rush-hour traffic 