Definition of play or keep one's cards close to one's chest or North American vest in English:

play (or keep) one's cards close to one's chest (or North American vest)

informal Be extremely secretive and cautious about one’s intentions: the less skilled negotiator feels vulnerable and is more likely to keep his cards close to his chest
More example sentences
  • So far, the special prosecutor has kept his cards close to his chest.
  • He keeps his cards close to his vest.
  • Who supports the program, who wants to phase it out, and who's keeping their cards close to their vest, trying to figure which way the wind will blow?
See parent entry: chest

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict