ace up one's sleeve

Meaning: A hidden advantage or secret resource kept in reserve to use when needed.

Language: English

Literally: (Already vivid in English)

Category: Daily Life

Origin: This one specifically means cheating, and it is worth separating from its near neighbors. Concealing a high card in the sleeve and introducing it at the decisive moment is fraud, and nineteenth-century gambling supply houses genuinely sold mechanical holdout devices — spring-loaded rigs strapped to the forearm — to make the switch quick and invisible. "A card up one's sleeve" softened this into a neutral hidden resource. "An ace in the hole" is different again and entirely legitimate: in stud poker the hole card is dealt face down by the rules, so a player with an ace there has a real concealed advantage nobody has cheated to obtain. The three phrases are used almost interchangeably now, but only one of them originally described breaking the rules.

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