単たん穴あな

noun

third favorite; possible winner

Horse-racing term for the horse expected to place third, often used in betting contexts alongside 本命 (favorite) and 対抗 (second favorite).

• 単たん穴あなの馬うまが予よ想そう以い上じょうに走はしって、2着ちゃくに入はいった。

  The third-favorite horse ran better than expected and finished second.

• 競けい馬ば新しん聞ぶんで単たん穴あなに印しるしがついている馬うまをチェックする。

  I check the horses marked as third favorites in the racing newspaper.