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An initialism of "ultraviolet," referring to the ultraviolet rays of the sun. The sunblock claims to filter out all UVs to keep your skin healthy in the sun.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. ultraviolet rays from the sun; sunshine. (Initialism.) I wanna get some UVs before we go home.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.