C
Caution
A player who deliberately or repeatedly infringes the laws is cautioned, and shown a yellow card. A cautioned player is suspended from playing for ten minutes.
Centre
They are the players wearing shirts numbers 12 & 13. They are divided into inside and outside centre.
Charge-down
When a player makes a defensive clearance kick, but it hits an opponent who has run towards him in an attempt to block it, it is known as a charge-down. These can be good try-scoring opportunities.
Cibi
The cibi is a Fijian war dance performed by the Fiji national team before each of their international matches.
conversion
If a team scores a try, they have an opportunity to "convert" it for two further points by kicking the ball between the posts and above the crossbar - that is, through the goal. The kick is taken at any point on the field of play in line with the point that the ball was grounded for the try parallel to the touch-lines. So it is advantageous to score a try nearer to the posts as it is easier to convert it.
The kick can be either a drop kick or a place kick in the 15-man game. However, in sevens, all conversions must be drop kicks.
Counter rucking
If a team (usually the team that took the ball into contact) has secured the ball at a ruck, and the other team manage to force them off the ball and secure possession themselves, the defending team are said to have "counter-rucked"
Crash ball
It is an attacking tactic where a player receives a pass at pace and runs directly at the opposition's defensive line. The crash ball runner attempts to commit two or more opposing players to the tackle, then attempts to make the ball available to team-mates by off-loading in the tackle or recycling the ball quickly from the ruck.
By committing players to the tackle, the crash ball runner creates holes in the opposition's defense, thereby creating attacking opportunities for team-mates.
Crash tackle
Another name for the crash ball as mentioned above.
Read more about this topic: Glossary Of Rugby Union Terms