Select the most appropriate meaning of the given idiom.

Walking on thin ice

doing something risky

The most appropriate meaning of the idiom "walking on thin ice" is doing something risky. It is an informal expression that means to be in a situation where there is a high potential for danger or failure. The idiom is thought to have originated in the 19th century, and it is believed to be a reference to walking on ice that is too thin to support your weight.

The other options for the meaning of the idiom are incorrect. Performing a ballet does not involve risk. Walking carefully does not involve risk. Slipping on ice is not the same as doing something risky.