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English definition of “it doesn’t take a rocket scientist to do something”

it doesn’t take a rocket scientist to do something

(also you don’t have to be a rocket scientist to do something)
humorous it is easy to do or understand something: It doesn't take a rocket scientist to figure out that if you treat her well, she'll be happier.
(Definition of it doesn’t take a rocket scientist to do something from the Cambridge Academic Content Dictionary © Cambridge University Press)

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