crystal ball

crystal ball idiom
A means of predicting the future, as in So what does your crystal ball say about the coming election? The term is a figurative use of the crystal or glass ball used by fortune-tellers. [c. 1900]

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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