A dark horse is a term used to describe an unexpected or UNKNOWN contender in a competition. The crossword solutions for the term DARK HORSE include BAY (3 letters), UNKNOWN (7 letters), CANDIDATE (9 letters), DUN (3 letters), ROAN (4 letters), CONTESTANT (10 letters), SLEEPER (7 letters), LONGSHOT (8 letters), UNDERDOG (8 letters), OUTSIDECHANCE (13 letters), and SURPRISEWINNER (14 letters). These words all refer to someone who is not expected to win, but may surprise everyone with their success.