爆冷门(bào lěngmén) to get an unexpected result

Usage:

“冷门”是指很少有人关注、不流行的工作或事业等,“爆冷门”则是指突然出现意料不到的结果。例如:在一场比赛中,不被看好的一方获胜或看好的一方输了就是爆冷门。
“冷门” means an unpopular job or career that few people pay attention to. “爆冷门” means to have unexpected results. For example: in a game, “爆冷门” means that the underdog wins or the favorite loses.

Sentences:

1、Zhècì bǐsài dàbào lěngmén, xīnshǒu dǎbài le shàngyījiè guànjūn.
这次比赛大爆冷门,新手打败了上一届冠军。
The match got an unexpected result in that a novice beat the reigning champion.

2、Shílì xuánshū de bǐsài gèngróyì bào lěngmén.
实力悬殊的赛事更容易爆冷门。
A badly mismatched event more easily creates a unexpected result.

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