Definition of an ace up one's sleeve or in the hole in English:

an ace up one's sleeve (or in the hole)

A plan or piece of information kept secret until it becomes necessary to use it.
More example sentences
  • Also tomorrow, we have another ace up our sleeve.
  • No sane person wants to get into a ‘knife fight,’ but it's comforting to have an ace up your sleeve if trouble finds you.
  • That's why you may need an ace up your sleeve for these lavish projects: the European-style kitchen system.
See parent entry: ace

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope