Definition of cluster

Two or more object balls that are touching or are close together.

24 Random Essential Billiards Terms

See overcut.
Making all of the required shots in a game (rack) without the opponent ever getting to the table or getting back to the table.
This is a low bet in a game with action.
This is a method of handicapping that designates a wild ball for a lesser player to be able to pocket at any point during a game in order to win.
To give a handicap to an opponent where they have to win a specified number less games than the other player in order to triumph in the match. The name refers to posting games on the scorekeeping mechanism known as a wire, though it is employed when no actual use of the particular device is available or intended.
A predetermined, fixed number of games players must win to win a match; "a race to seven" means whomever wins seven games first wins the match.
Five-pin billiards is a today usually a carom but sometimes still a pocket form of cue sport, popular especially in Italy and Argentina but also in some other parts of Latin America and Europe, with international, televised professional tournaments. The game is sometimes referred to as Italian five-pins or Italian billiards.
A rare and very difficult trick jump shot that turns into a draw shot upon landing. Requires precise application of spin in addition to the precise application of ball pressure to effectuate the jump. Jump draws are fairly often seen in professional trick shot competition.
Describing a shot which requires one or more balls to be played off several cushions, such as an elaborate escape or a positional shot; "he'll have to send the cue ball round the angles to get good position."

Noun:
1.In pool games such as nine-ball, a specific handicap given (e.g., "what spot will you give me?").
2.In snooker, any of the six designated points on the table on which a colour ball is replaced after it has left the playing surface (usually after it has been potted).
3.An (often unmarked) point on the table, at the intersection of two strings. See foot spot, head spot, center spot for examples.
4.In UK eight ball, (when not playing with a reds-and-yellows colour ball set) any of the group of seven balls, other than the 8, that are a solid colour with just a circled number on the surface. In the US, these balls are usually referred to as solids or more colloquially as lows, littles or smalls, while British terms include dots and unders. Contrast stripes.
5.Alternate name for a table's diamonds.

Verb:
1.In pool, return an illegally pocketed object ball to the table by placement on the foot spot or as near to it as possible without moving other balls (in ways that may differ from ruleset to ruleset).
2.In snooker, to return a colour ball to its designated spot on the table. Also called re-spot.
3.In nine-ball, the giving of a handicap to the opponent where they can also win by making a ball or balls other than the 9 ball (e.g. "she spotted me the seven ball").
4.In eight-ball, one-pocket and straight pool, the giving of a handicap to the opponent where they have to make fewer balls than their opponent does.
5.In some variants of pool, to place the cue ball on the head spot or as near to it as possible inside the kitchen/baulk, after the opponent has scratched.

This is to take all the money from a player or to have lost all of your own money.
This is a shot in snooker where the cue ball follows a struck object into the pocket.
The person who is a provider of all or part of a player's stake (money) for a gambling session in which one is not a player.
A British term for someone with little experience or understanding of the game, who may be skilled at potting individual balls but does not consider tactics such as position or safety; "he's a potter not a player." See also banger.
To sink a ball into a pocket.
An imaginary line drawn from the desired path an object ball is to be sent (usually the center of a pocket) and the center of the object ball.
In snooker, any of the three colour balls that get spotted on the baulk line: the yellow, green or brown ball.
A barrel is how much money per game a player is betting. As in, "I have ten barrels at $20 a game".
Successive games won without the opponent getting to the table; a five-pack would be a package of five games.
To contact the chosen object ball in such a way to make it bank off a rail before being pocketed.
Chiefly American: Also known as side spin, english (which is usually not capitalized) is spin placed on the cue ball when hit with the cue tip to the left or right of the ball's center. English has a marked effect on cue ball rebound angle off cushions (though not off object balls), and is thus crucial for gaining shape; and can be used to "throw" an object ball slightly off its otherwise expected trajectory, to cheat the pocket, and for other effects. "English" is sometimes used more inclusively, to colloquially also refer to follow and draw. In combination one could say bottom-right english, or like the face of a clock (4 o'clock english). The British and Irish do not use this term, instead preferring "side".
Random method for pairing of opponents when setting up a bracket system for a tournament.
Chiefly American: The cushion on the head rail. Compare bottom cushion; contrast foot cushion.
Any ball that may be legally struck by the cue ball.