1. child's play - Noun
2. child's play - Phrase
any undertaking that is easy to do
activity by children that is guided more by imagination than by fixed rules
Source: WordNetSo they didn't let anybody else off. I can't live anymore, they've done me. Auschwitz was just a child's play. Witold Pilecki
Since the beginning of time, children have not liked to study. They would much rather play, and if you have their interests at heart, you will let them learn while they play; they will find that what they have mastered is child's play. Carl Orff
Learning is not child's play we cannot learn without pain. Aristotle
The ability... to experiment with imaginary situations, gives man a freedom... the pleasure in trying out and exploring imaginary situations. A child's play is concerned with this pleasure; and so is much of art, and much of science... [P]ure science... is a form of play, in this sense. Jacob Bronowski
I also found child's play - stuff that was not considered serious, but goofy - was the stuff I liked to do, so I still do it as an adult. Matt Groening
It is no child's play when an old woman dances. Danish Proverb