rocket science noun
[noncount] 1 : the science of designing or building rockets 2 : something that is very difficult to learn or understand
▪ The job is challenging, but it's not exactly rocket science.
▪ The job is challenging, but it's not exactly rocket science.
— rocket scientist noun, plural ∼ -tists [count]
▪ You don't have to be a rocket scientist [=you don't have to be unusually smart] to understand the instructions.
▪ You don't have to be a rocket scientist [=you don't have to be unusually smart] to understand the instructions.
