Select the most appropriate meaning of the given idiom.

A dark horse

an unknown genius

The most appropriate meaning of the idiom "a dark horse" is >an unknown genius.<

This idiom is used to describe someone who is not well-known or highly regarded, but who has the potential to be successful or achieve great things. It is a metaphor for a horse that is not expected to win a race, but who surprises everyone by doing so.

For example, you might say that a young politician is a dark horse if they are not well-known, but have the potential to be a great leader.

The other options are not correct.

• An expected outcome: This does not mean the same thing as an unknown genius.
• A well kept secret: This means something that is not known to many people.
• A horse of a fine breed: This means a horse that is of high quality.