leap of faith

leap of faith idiom
A belief or trust in something intangible or incapable of being proved. For example, It required a leap of faith to pursue this unusual step of transplanting an animals' heart into a human patient.

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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