twenty-twenty hindsight, with

twenty-twenty hindsight

The ability to determine how some mistake or failure in the past could have been avoided. Often used ironically or sarcastically; sometimes stylized as "20/20 hindsight." I can see now that having my brother as my legal counsel was unwise, but I guess twenty-twenty hindsight isn't much use right now. A: "I can't believe I was ever interested in such a self-absorbed jerk." B: "Don't beat yourself about it. We all have 20/20 hindsight."
See also: hindsight

with twenty-twenty hindsight

With the benefit of one's current knowledge or experience, thus allowing them to see why something in the past was wrong or how some mistake could have been avoided. Said when examining some negative past event retrospectively. Sometimes stylized as "with 20/20 hindsight." I spent my whole life working, almost every minute of every day. Now, with twenty-twenty hindsight at the end of my life, I see that I squandered the time I could have been spending with my family. Of course, with twenty-twenty hindsight, it's easy to laugh at the quack doctors of the early 19th century, but back then, even legitimate medicine was still largely rooted in superstition and pseudoscience.
See also: hindsight
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

twenty-twenty hindsight

Knowledge after the fact, as in With twenty-twenty hindsight, I wouldn't have bought these tickets. This idiom uses twenty-twenty in the optometrist's sense, that is, "indicating normal vision," and hindsight in the sense of "looking back" or "reconsidering." [First half of 1900s]
See also: hindsight
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.

twenty-twenty hindsight

and 20/20 hindsight
n. an ability to figure out what one should have done after it is too late to do it. Everybody has twenty-twenty hindsight!
See also: hindsight
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

twenty-twenty hindsight, with

With complete after-the-fact knowledge. This expression, usually preceding a statement like “I would have done or said such-and-such,” uses the optometrist’s term for perfectly normal vision. The idea that hindsight, with its superior knowledge, is better than foresight has been stated since at least the nineteenth century. “If a man had half as much foresight as he had hindsight, he’d be a lot better off,” wrote Robert J. Burdette (Hawk-eyes, 1879). The Hollywood screenwriter Billy Wilder is quoted as having said, “Hindsight is always twenty-twenty.”
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
See also: