have a card up sleeve

have a card up your sleeve

to have an advantage that other people do not know about I still had a card up my sleeve in the form of a letter from his father.

Name	Pronounced	Usage
Katrijn	kaht-RIEN	Dutch
Suellen	soo-EL-ən	English
Josefina	ho-se-FEE-nah (Spanish), zhoo-zə-FEE-nə (Portuguese), yoo-se-FEE-nah (Swedish)	Spanish, Portuguese, Swedish
Gizi	-	Hungarian
Olov	OL-ov	Swedish
Zartosht	-	Persian