| dark horse 1. a person who does not tell other people about their ideas or skills and who surprises people by doing something that they do not expect. I didn't know Linda had written a novel. She's a bit of a dark horse, isn't she? 2. a person who wins a race or competition although no one expected them to. 17-year-old Karen Pickering could also be a dark horse for (= she could win) a medal in the European Championships. (sometimes + for) |