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rub up on
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Idioms and Phrases
Refresh one's knowledge, as in I must rub up on my French before we leave for Paris . [Second half of 1700s] Also see brush up , def. 2.Advertisement
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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