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keep it up

Continue to do or maintain something, as in They were playing loud music, and they kept it up all night long. [Mid-1700s] Also see keep up, def. 4.

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