keep cards close to chest

keep/play your cards close to your chest

to not tell anyone what you plan to do I never know what Martin's next move will be. He plays his cards close to his chest.

Name	Pronounced	Usage
Jorja	JAWR-jə	English (Modern)
JoŽE	YAW-zhe	Slovene
Kohinoor	-	Various
Cronus	KRO-nəs (English)	Greek Mythology (Latinized)
Yaropolk	-	Medieval Slavic
Sadaf	-	Arabic