To have a hidden advantage or resource that others are not aware of.

एक छुपी हुई बढ़त या संसाधन होना जिसके बारे में दूसरों को जानकारी न हो।

English Usage: He managed to win the game because he had an ace up his sleeve.

Hindi Usage: उन्होंने खेल जीता क्योंकि उनके पास तुरुप का पत्ता था।