one in a million

one in a million idiom
Also, one in a thousand or billion. Extraordinary, rare, as in She's the kindest soul—she's one in a million, or This ring is one in a thousand. All these terms are hyperbolic.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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