Wiktionary
adv. In a reserved or secretive manner. alt. In a reserved or secretive manner.
Usage examples of "close to the vest".
Best to play one's cards close to the vest, let Kepler wonder whether Epiphyte Corp.
Sometimes he even believed it: the Lizards did have a way of playing it close to the vest now and again, as if they were short of soldiers and ammunition.
Except for Jack, the crows always played their cards close to the vest.
Lindros, keeping his secret close to the vest for all this time, almost lost his nerve then, but duty won out over compassion.
Hunter had met few people who played everything so close to the vest, almost as if the purpose of his mask was not just to hide his face but also to represent a symbol of his reticence.
I questioned all of them, asking if they had heard of a fair, blond woman held captive in the castle, keeping my reasons close to the vest.
Glen Bateman seconded the motion, adding that from time to time there might be other business--such as the real reason for the Burial Committeethat we should keep close to the vest.