There are a lot of betting terms to master, and understanding, here you can find the general online betting terms out there:
Canadian: A bet on five selections covering doubles, trebles, four folds and a fivefold
Carpet: A ‘tic-tac’ term used in the betting ring for 3/1.
CD / C&D: Course and Distance. A sign that a horse has won over the course and distance a race is taking place.
Chalk: The favorite.
Chalk player: A person who usually places his bets on the favorite.
Chasing: Betting on things you normally wouldn’t in order to recover losses.
Cheek Pieces: Headgear worn by horses to help performance
Clerk of the Scales: The official responsible for ensuring all jockeys weigh in correctly at the end of a race.
Circled Game: Applies to US sports. A game where the betting activity is limited by the bookmaker; this usually happens where bad weather or injury may significantly alter the chances of either team winning, thereby making the outcome far more uncertain.
Correct Score: Correct score betting is popular with football, where the total number of typical scores is limited. The odds are dependent on the actual match odds between the two teams.
Co-Favourite: A favourite who is joint favourite with at least two other horses.
Conditional Jockey: A young jumps jockey who gains a weight allowance over more experienced jockeys. The weight allowance decreases as the jockey gains more victories.