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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."
talk twenty to the dozen
To talk (to someone) very rapidly, hurriedly, and/or energetically. My aunt can get talking twenty to the dozen if you get her on a topic she's passionate about.
A very brief nap or a short sleep. When you have a baby for the first time, you are suddenly forced to learn how to operate on only twenty winks at a time. I'm going to go grab a quick twenty winks before everyone starts arriving for the dinner party.
be (on) the wrong side of (an age)
To be older than a certain age. Why is she dressing like a teenager when she is clearly the wrong side of 40? I'm sore after every workout these days, so I'm definitely on the wrong side of 30!
be (on) the right side of (an age)
To be younger than a certain age. You can get away with dressing like a teenager when you're still on the right side of 30. I was never sore after working out back when I was on the right side of 40!
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 hindsightand 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