English ⇄ Russian

keep one's cards close to one's chest stresses
idiom.	держать что-либо в тайне (dj_formalin); не рассказывать никому о своих планах (dj_formalin)
inf.	не раскрывать карты (You never ​quite ​know what Barry's going to do next – he ​keeps his ​cards very ​close to his ​chest. 4uzhoj)