ace in the hole
一個秘密的策略、計劃或資源,可以在緊急情況下使用
口語·書面語·形容秘密優(yōu)勢或殺手锏
英文釋義
a secret advantage or resource that can be used in a situation when it is needed
例句
The team kept their star player as an ace in the hole for the final match.
典故來源
源自撲克游戲,玩家暗藏一張王牌(ace)在手中,關(guān)鍵時刻打出制勝。