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]
Words nearby twenty-twenty hindsight
How to use twenty-twenty hindsight in a sentence
Why would “they” want to crush him just for attempting to buy something twenty years ago?
Even the legendary 1980s televisions show Dallas is back on the air, selling its twenty-first century brand of Texas bravado.
A friendly twenty-something woman originally from Toronto said it best.The Craziest Date Night for Single Jews, Where Mistletoe Is Ditched for Shots|Emily Shire|December 26, 2014|DAILY BEAST
By the end of the construction period, the number of deaths had reached roughly twenty percent of the workforce.
Twenty-one-and-a-half million students participate in free or reduced-price school lunch programs.
I presume the twenty-five or thirty miles at this end is unhealthy, even for natives, but it surely need not be so.
Before daybreak we had ridden five and twenty miles, but had been compelled to abandon two more guns.
On four bells there are four times as many changes as on three; that is—four times six changes, which makes Twenty-four.Tintinnalogia, or, the Art of Ringing|Richard Duckworth and Fabian Stedman
This vessel, loaded with supplies, went ashore and was lost; and one hundred and twenty Japanese and three Dutchmen were drowned.
I do not think the average number of passengers on a corresponding route in our country could be so few as twenty.