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show one's hand
Fig. to reveal one's intentions to someone. (From card games.) I don't know whether Jim is intending to marry Jane or not. He's not one to show his hand. If you want to get a raise, don't show the boss your hand too soon.
show your hand
to tell people your plans or ideas, especially if you were keeping them secret before
Usage notes: When card players show their hand in a game of cards, they show the other players the cards they are holding, usually because they cannot continue to play the game.I'm a bit reluctant to show my hand at this stage in the proceedings.
show (one's) hand
1. Games To display one's cards with faces up.
2. To state one's intentions or reveal one's resources, especially when previously hidden.