( BrE ) ( NAmE an ace in the ˈhole )
( informal ) a secret advantage, for example a piece of information or a skill, that you are ready to use if you need to
( BrE ) ( NAmE an ace in the ˈhole )
( informal ) a secret advantage, for example a piece of information or a skill, that you are ready to use if you need to
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005