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rub up on
Refresh one's knowledge, as in
I must rub up on my French before we leave for Paris
Second half of 1700s
, def. 2.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Nearby words for rub up on
rub someone the wrong way
rub someone's nose in it
rub the bacon
rub the wrong way
rub up on
Piece of cake?