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English definition of “it's not rocket science”

it's not rocket science

(also it doesn't take a rocket scientist) humorous
used to say that you do not think that something is very difficult to do or to understand: Come on, it's only a crossword, it's not rocket science. Drugs equals crime. It doesn't take a rocket scientist to figure that one out.Easiness and simplicity
(Definition of it's not rocket science from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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