keep it up

keep it up idiom
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.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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