Ace
Definition 1 of 5
Pro Tip 1/2
Card Games Reference
Understand that 'ace' is often used in idioms meaning a secret advantage. He has an ace up his sleeve in negotiations.
Pro Tip 2/2
Cultural Symbolism
The 'ace of spades' can symbolize good luck or death, depending on the context. In some stories, finding an ace of spades is an ominous sign.