「攤牌」，本意指「把手裡所有的牌擺在桌面上（lay one's cards on the table, reveal one's cards）」，後比喻「把事情的有關情況都向對方公開，表明自己的真實意圖」，與英語習語「show one's hand」意思相近，表示「to make one's plans, intentions, ideas, or resources known to others, especially those that were previously hidden or kept secret」。
例句：
在商務談判中，關鍵是不要馬上攤牌，否則你可能會失去最好的交易機會。
In business negotiations, it's important that you don't show your hand right away, or you might risk losing out on the best deal possible.
他們要是不肯攤牌，談判就不會有進展。
The negotiations will not make progress as long as they refuse to show their hand.