Select the most appropriate meaning of the given idiom.

Child’s play

Something that is very easy to do

The most appropriate meaning of the idiom "child's play" is something that is very easy to do.

The other options are incorrect.

• "Something for a child to play with" does not mean something that is very easy to do. Toys are typically designed for children to play with, but they can be difficult to use.
• "Something that everybody knows" does not mean something that is very easy to do. There are many things that everybody knows, but they are not necessarily easy to do.
• "Something children have made by themselves" does not mean something that is very easy to do. Children can make many things, but some of them can be quite challenging.

The idiom "child's play" comes from the idea that children are naturally good at playing, and that playing is something that they do easily. In the same way, something that is child's play is something that is very easy to do. For example, you might say that solving a puzzle was child's play for the child prodigy.