The definition of cardsharp means someone who is very good at cheating in card games.
A blackjack player who can count the deck is an example of a cardsharp.
Informal a professional cheater at cards
An expert in cheating at cards.
- One who is skilled at card games, especially at cheating in them.
- One of Tim's great-grandparents had been a cardsharp in the wild west, and had been shot dead during a game.