card up sleeve

card up (one's) sleeve

A secret resource or plan held in reserve: a tough negotiator who had a number of cards up his sleeve.

Name	Pronounced	Usage
Zevulun	-	Biblical Hebrew
Joanne	[dʒəu'æn]
Maks	MAHKS	Russian
Kacey	KAY-see	English (Modern)
Hikaru	hee-kah-ṙoo	Japanese
Robyn	['rɔbin]