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Something that is very easy to understand, achieve, or use, especially when encountered by one on a more advanced level. The highly anticipated match turned out to be kids' stuff for the returning champions. Do you have anything more difficult? This book is kids' stuff.
a very easy task. Climbing that hill is kid's stuff. Driving an automatic car is kid's stuff.
kids' stuffsomething that is childishly simple or naive. informal
1982 Vivien Alcock The Sylvia Game He had grown out of the game; it was kid's stuff. Besides it always landed him in trouble.