The idiom 'the city that never sleeps' signifies a bustling place with constant activity.
The meaning of the idiom 'the city that never sleeps' is to express that if you want to do everything there is to do, you wouldn't have time to sleep. It signifies a place that is always bustling with activity, where there is so much to see and do that people are constantly engaged and do not have time for rest. New York City is a famous example of a 'city that never sleeps', known for its vibrant nightlife and countless entertainment options.
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