Question

dark horse I can’t tell you anything about his intentions. He’s a dark horse.

Accepted Answer

If you refer to someone as a dark horse, you mean that they are secretive, or that little is known about them, so you don’t know how they will react or perform.

Phrase/Idiom	dark horse
Definition	If you refer to someone as a dark horse, you mean that they are secretive, or that little is known about them, so you don’t know how they will react or perform.
Example	I can’t tell you anything about his intentions. He’s a dark horse.

Dark Horse Refer Secretive Don’t React Perform I