sight unseen

sight unseen idiom
Without having viewed the object in question, as in He bought the horse sight unseen. This seeming oxymoron—how can a sight, which means something seen, be not seen?—dates from the late 1800s.

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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