leap in the dark

leap in the dark idiom
An act whose results cannot be predicted. For example, Given today's high divorce rate, he considered marriage a leap in the dark. [Late 1600s]

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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