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1. To fly an airplane in extremely low visibility, relying on the plane's instruments instead. The huge plume of ash sent into the air by the volcano forced the pilots to fly blind.
2. By extension, to do something based on guesswork, intuition, or without any help or instructions. Since this is our first attempt at developing an app, we'll be flying blind as we figure out how to get things working correctly. I've never filed my own taxes before, so I'm sort of flying blind.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Feel one's way, proceed by guesswork, as in There are no directions for assembling this furniture, so I'm flying blind. This hyperbolic expression dates from World War II, when it was used by pilots who could not see the horizon and therefore had to rely on instruments. It was transferred to broader use soon afterward.
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.
Proceeding by guesswork, groping one’s way. The term originated during World War I and alluded to poor visibility. Later it was extended to other enterprises, as in, “My predecessor quit without leaving any instructions, so for this first department meeting I’m flying blind.” See also by the seat of one's pants.
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer