rub up on

Idioms  

1. 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.

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Example Sentences

“And it’s like he knows, he can sense, that maybe they aren’t having a good day. And he will just rub up on them and sit in their lap, and be like, I’m here for you.”

From Washington Times

French must be studied hard all summer if they are to go abroad, and Kent must be coached, as he is very rusty 305 in his French and must rub up on it for lectures at the Beaux Arts.

From Project Gutenberg

"I could rub up on French and German, and read up the treatment for toothache and burns—but experience!"

From Project Gutenberg

Nice to rub up on the old days!

From Project Gutenberg