Setup
A setup is a pair of suited decks, each with a different colored back, that replaces the decks in play. Card rooms use two decks to keep the game fast: one is shuffled while the other is dealt.
The simple explanation
The dealer uses one deck while the other is being shuffled. When a new set is called for, the room brings a fresh setup.
A closer look
The two decks have different back colors, so they cannot be mixed up. Changing the decks is a way to keep the game fair, and players may ask for a new setup. A new setup is also called for when a deck is damaged or marked.
A practical example
A player asks for a new setup, and the dealer brings two new decks with red and blue backs.
Full explanation
A setup is a pair of suited decks, each with a different colored back, that replaces the decks in play. Card rooms use two decks to keep the game fast: one is shuffled while the other is dealt.
A setup is two new decks with different back colors.
It replaces the decks in play.
It keeps the game fair.
Players can ask for it.
Alternative spelling: set-up, set up