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Without having ever seen or inspected the particular person or thing in question. In this country, it's not uncommon to be arranged to marry someone sight unseen. Only a fool would buy a car sight unseen.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
sight unˈseenif you buy something sight unseen, you do not have an opportunity to see it before you buy it: We bought the table sight unseen and were pleased to find it was perfect for our kitchen.
Farlex Partner Idioms Dictionary © Farlex 2017
Without seeing the object in question: bought the horse sight unseen.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Without previous examination; taken on faith. This term, which implies accepting something without verification, dates from the late nineteenth century. The 1898 Yearbook of the United States Department of Agriculture stated, “The intelligent farmer of today has got beyond buying ‘sight unseen’ when it comes to fertilizer.”
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer