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Idioms and Phrases with keep late hours

keep late hours

Stay awake until late at night. For example, Never call Ethel before noon; she keeps late hours and sleeps all morning.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.