rub up

verb
rubbed up; rubbing up; rubs up

Definition of rub up

transitive verb

1 : to revive or refresh knowledge of : recall
2 : to improve the keenness of (a mental faculty)

First Known Use of rub up

circa 1571, in the meaning defined at sense 1

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The first known use of rub up was circa 1571

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incapable of being surmounted or overcome

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