Ace in the Hole (1)
It is surprising how many expressions that Americans use every day came from the card game, a poker. For example, you hear the expression "ace in the hole" used by many think of going near a poker table. An ace in the hole is any argument, plan or thing until needed, especially when it can turn failure into success. In poker and most card games, the ace is the highest and most valuable card. It is often a winning card.
  


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