“Stack the deck” comes from the world of card games. Originally, it referred to cheating by arranging the cards in a particular order before dealing. If a dishonest dealer knew where certain cards were, they could give an advantage to themselves or to another player. In other words, the outcome was unfairly influenced from the very beginning.
Over time, the phrase moved beyond gambling and became a general metaphor. Today, if someone stacks the deck, they set up a situation so that one side has an unfair advantage and the other side has little chance to succeed.
- Original meaning: A card dealer secretly arranges the deck before the game.
- Modern meaning: Someone designs rules or conditions to favor one side.
- Example: Critics said the selection process stacked the deck against smaller applicants.
This is why the phrase often appears in discussions about rules, systems, and decisions. It suggests not just advantage, but an advantage created unfairly in advance.