keep under one's hat   (TTS發音)

keep secret 保密

    If I tell you the date of the election，can you keep it under your hat？假如我把選舉日期告訴你，你能對此保密嗎？

    We have won the contract for the new tax computer，but keep it under your hat until it's announced officially. 我們已經贏得了這份新型稅務計算機的合同，但在正式宣布之前還要保密。

    Mr. Jones knew who had won the contest，but he kept it under his hat until it was announced publicly. 瓊斯先生早已知道誰在這次比賽中獲勝，但他保守秘密直到正式宣布為止。