大だい金きん星ぼし

noun

major upset; surprise victory; coup

Originally a sumo term for a low-ranked wrestler defeating a yokozuna; now used broadly in sports and other competitions for a stunning underdog win.

• 高こう校こう野や球きゅうで無む名めいのチームが優ゆう勝しょう候こう補ほを破やぶる大だい金きん星ぼしを挙あげた。

  An unknown team pulled off a major upset by beating the tournament favorite in high school baseball.

• 彼かれは横よこ綱づなから大だい金きん星ぼしを奪うばった。

  He scored a huge upset victory over the yokozuna.