Peg
To peg cards is to mark the fronts of cards with a pin, tack or ring so that the cheater can later tell their rank by touch. It is a cheating technique.
The simple explanation
A cheat who pegs cards makes small marks on the face with a sharp object. He can then feel the card and know what it is.
A closer look
Pegging marks do not tear the cards, and they are hard to see. Casinos use fresh decks and inspect them. Pegging is one of several marking techniques, with pricking and waving. If you suspect that cards are marked, tell the floor.
A practical example
A dealer feels tiny bumps on several cards and calls the floor to change the deck.
Full explanation
To peg cards is to mark the fronts of cards with a pin, tack or ring so that the cheater can later tell their rank by touch. It is a cheating technique.
Pegging is marking card faces with a sharp object.
The cheater can feel the rank.
Casinos inspect decks.
Report marked cards.