Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: From normal sight being judged on the ability to read letters at a distance of 20 feet

twenty-twenty

noun
     
twenty-twenty , 20/20 [uncountable]
1M

twenty-twenty vision

the ability to see things normally, without needing glasses:
A pilot must have twenty-twenty vision.
2

twenty-twenty hindsight

used to say that it is easy to know what you should have done in a situation after it has happened, but you did not know what to do earlier

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