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Related to hindsight: hindsight is 20/20
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Foresight is better than hindsight.

cliché It is better to anticipate and prevent future problems than to realize how they could have been avoided after the fact. If I were you, I would pay the extra $50 for full insurance coverage while you're traveling. You never know what might happen, and foresight is better than hindsight.
See also: better

hindsight is (always) 20/20

It is easier to clearly reevaluate past actions or decisions than when they are being made or done; things are clearer or more obvious when they are reflected upon. A reference to the visual acuity of normal eyesight (20/20 vision). I can see now that having my brother as my legal counsel was unwise, but I guess hindsight is always 20/20. A: "I can't believe I was ever interested in such a self-absorbed jerk." B: "Don't blame yourself. Hindsight is 20/20, after all.
See also: 20, hindsight

in retrospect

 and in hindsight
reconsidering the past with the knowledge one now has. In retrospect, I would have gone to a better college. David realized, in hindsight, that he should have finished school.

in retrospect

looking back on something that happened I think that, in retrospect, we were wrong to insist that she move to an apartment.

in retrospect

Looking backward, reflecting on the past. For example, In retrospect, he regarded his move as the best thing he'd ever done. This idiom employs retrospect in the sense of "a view of the past." [Second half of 1600s]

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

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

20/20 hindsight

See also: 20, hindsight

in retrospect

In looking back on or reviewing the past.
References in periodicals archive ?
We all know that hindsight is 20/20 and now with Brandwatch Twitter Hindsight, our customers can see clearly what's working and what isn't.
Ultimately, hindsight bias matters because it gets in the way of learning from our experiences.
Thus, his tax liability did not increase or decrease with the late filing of his MTM election and the IRS could not argue successfully that he used hindsight in making the election after the deadline.
In hindsight, as we socialized our capabilities with our stakeholders, we should have made a more focused effort to socialize the means by which we provided our capability: the RDC.
The ads show how Liberty Mutual is financially strong and successful because we think ahead and run our business with foresight rather than hindsight," said Lisa Scannell, vice president of communications support.
Not sure what Tony Hawk had going in '91, but with the benefit of hindsight, it's hard to image it could have inspired a generation as much as that death-defying double kink boardslide.
Yet as much as Le Va's early work was seen to be representative of its art-historical context, with hindsight it seems that the materialist or structuralist readings predominant in the late '60s failed to account for the deeper, metaphorical content of the work.
The challenge of living daily with a biological time bomb, sojourning through difficult times, the crucial support of friends and family and the difficult choices that take their toll, as well as wisdom borne of 20/20 hindsight, fill this powerful testimony.
01 of Visual Hindsight Professional Edition, a Windows NT, 2000, 2003 Server, and XP program that offers professional-grade network camera surveillance and recording for the Desktop Video Surveillance domain.
With the benefit of hindsight," Buckley told the Times, "Saddam Hussein wasn't the kind of extra-territorial menace that was assumed by the administration one year ago.
In communities across the South, Confederate veterans and men in positions of power passionately spoke of their war efforts as having been founded on their love and admiration for women, a claim that many have since derided as merely the sentimental hindsight of the Lost Cause.
SIR - I am a Hansen supporter, by and large, but his complaint that the criticism of the decision to play against the wind in Dublin was made with the benefit of hindsight is quite wrong.
ONE OF the first charge nurses I ever worked with once said to me that hindsight was a wonderful thing.
We all know that hindsight is 20/20, and in no other endeavor is that more true than in bowhunting.
Armed with 20/20 hindsight, Miniter finds a long series of missed opportunities to capture or kill the terrorist.