throw a curve
出乎意料地改變某事或某人的方向或進展
口語·形容意外情況
英文釋義
to surprise or deceive someone
例句
The boss threw a curve when he announced the meeting was canceled at the last minute.
典故來源
源自棒球術語,投手投出曲線球使擊球手難以預測,比喻出人意料的行為。