穴あな馬うま

noun

dark horse; unexpected winner

Refers to a candidate or competitor who unexpectedly wins or succeeds, often used in elections, sports, and business contexts.

• 今こん回かいの選せん挙きょでは、穴あな馬うまの候こう補ほが当とう選せんした。

  In this election, a dark horse candidate won.

• 彼かれは大たい会かいで穴あな馬うま的てき存そん在ざいだったが、優ゆう勝しょうした。

  He was a dark horse in the tournament, but he won.