Correct Answer: Cramp

Solution : The second option is correct.

The idiom charley horse is commonly used to describe a sudden, painful muscle cramp or stiffness, typically in the leg. In the given sentence, when someone says, She's got a charley horse in her leg , it means that she is experiencing discomfort or pain due to a muscle cramp in her leg. It's a colloquial way of expressing muscle-related discomfort or pain.

Therefore, the most appropriate meaning of the given idiomatic expression is, Cramp .