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3. rub up on

rub up on

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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] Also see brush up, def. 2.

See also: on, rub, up

rub up on

To refresh one's knowledge of: I have to rub up on my French.

See also: on, rub, up