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не раскрывать свои карты stresses
gen.	conceal one's hand (Beloshapkina)
saying.	play cards close to one's chest (WiseSnake)
не раскрывать своих карт
gen.	play it close to the chest
idiom.	keep your cards close to your vest (Natalia D)
Makarov.	play one's cards close to the chest
не раскрывая свои карты
gen.	close to the vest (driven)

не раскрывать свои карты: 3 phrases in 2 subjects

Figure of speech	1
General	2