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ace up one's sleeve
Language:
en
1.
US
UK
general
informal
colloquial
A hidden advantage, plan, or resource kept secret until it can be used to gain an edge or achieve success.
2.
US
UK
general
informal
disapproving
A concealed or illicit means of cheating or deception, especially a hidden playing card used to gain an unfair advantage.
Examples:
EN:
That's Korosensei's ace up one's sleeve.
ES:
Eso es el as de Korosensei uno de la manga.
ID:
Itu senjata rahasia Korosensei.
Validation Count:
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Sourced from Wiktionary