rub up

verb

rubbed up; rubbing up; rubs up

transitive verb

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

Examples of rub up in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This pentagonal structure is the part that rubs up against the C ring. Quanta Magazine, 20 Apr. 2026 Besides the music, the main appeal of raving is the feeling: of heads jolting to the sound of the beat, and sticky bodies rubbing up against one another as night turns into day. Álex Maroño Porto, The Atlantic, 14 Mar. 2026 Many other midlayer face fabrics start to pile after a couple months of use, but the fabric that covers the Atom has stayed intact for years, even when repeatedly rubbing up against the inside of a shell or against a pack. Jakob Schiller, Outside, 16 Feb. 2026 The baby tumbled around at the surface, flipping her white belly to the sky and rubbing up against her mother’s back. Kelso Harper, Scientific American, 16 Dec. 2025 See All Example Sentences for rub up

Word History

First Known Use

circa 1571, in the meaning defined at sense 1

Time Traveler
The first known use of rub up was circa 1571

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Cite this Entry

“Rub up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rub%20up. Accessed 2 May. 2026.

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