not rocket science
The phrase "not rocket science" is a figure of speech used to imply that something is not complex or difficult to understand. It suggests that a particular task or concept is relatively simple and does not require specialized knowledge or skills.
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
Play Just Saying - the word game that makes learning idioms a good time on your mobile phone or tablet.