Definition of Clock

This is a shot in one pocket pool where you simple aim at a cluster of balls near your opponents pocket to attempt to make something good happen out of desperation because other shots are not feasible.

In the carom games, any shot where the end result is all the balls near each other; ideally, in position for the start of a nurse on the next stroke.

Describes a cue ball sliding on the cloth without any top spin or back spin on it.

A semicircle with an 11½ inch (291 mm) radius, drawn behind a snooker table's baulk line, centred on the middle of the line, and resembling the upper case letter "D" in shape. The "D" is also used in English billiards and sometimes also in blackball and other pool games played on British-style tables.

Also shortstop, short-stop. This is a player that is excellent at pool, but tends to fall short of number one. A shortstop is the best player relative to a particular scene. A second-tier professional who is not (yet) ready for World Championship competition. It can also be applied by extension to a player who is one of the best in a region but not quite good enough to consistently beat serious road players and tournament pros. The term was borrowed from baseball.

In blackball, a situation where the player cannot see any of the balls she/he wants to hit due to obstruction by other balls or the knuckle of a pocket. The player must call "total snooker" to the referee, which allows a dispensation to the player from having to hit a cushion after contacting the object ball, which is otherwise a foul.

A multi-game division of a match, as used in some league and tournament formats. For example, in a match between 2 teams of 5 players each, a 25-game match might be divided into 5 rounds of 5 games each, in which the roster of one team moves one line down at the beginning of each round, such that by the end of the match every player on team A has played every player on team B in round robin fashion.
A level of competition elimination in a tournament, such as the quarterfinal round, semifinal round and final round.

This is the raised portion on the side of the table; the cushions are essentially rubber bumpers covered in the table cloth.

This is an imaginary player that you can attempt to run a rack against when playing a practice or training game.

A bridge formed by the hand where no finger loops over the shaft of the cue. Typically, the cue stick is channeled by a "v"-shaped groove formed by the thumb and the base of the index finger.

British term referring to the base or metaphorical "feet" of a ball that rattles in the jaws of a pocket before eventually dropping. Usually said of an object ball for which the intention was to pot it.

The full fifteen ball set of pool or snooker object balls after being racked, before the break shot (i.e., same as rack, definition 2, and triangle, defn. 2). Chiefly British today, but also an American usage ca. World War I.

The World Confederation of Billiard Sports (WCBS, sometimes called the World Confederation of Billiards Sports) is the international umbrella organization encompassing the major cue sports (billiards-type games), including carom billiards, pool games of several varieties, and snooker. The primary aim of WCBS is to establish billiard-type sports as medal events in as many multiple-sports competitions as possible, on both regional and world levels. The ultimate goal of WCBS is to have billiard sports included in the Olympic Games.

Chiefly American: The short rail at the head of the table. Traditionally this is the rail on which the table manufacturer's logo appears. Compare bottom rail, baulk rail; contrast foot rail.

This is a player that will regularly loose money to a particular player that is obviously a better player.

The tip of your cue is the smallest but most important piece on all of the stick. Ranging between 12 mm and 14 mm depending on the taper of you shaft, the average and most common tip size is 13 mm. The tip is usually made from treated and compressed leather and is attached at the top of your cue by screw or glue to the ferrule. There are variances in cue tip resistance from soft to hard. The softer offering more chalk retention, and the harder offering more longevity and power transferred through your shot (the hardest, phenolic tips are often used on the break). Because the surface of the tip is beveled it offers you control on the spin and direction of the cue ball in your shot. To keep this control, it is important to scuff up the surface of your cue a little so as to enhance the chalk retention potential. In addition to keeping you tip chalked, you want avoid it mushrooming over the ends of the ferrule after too many impacts without refinement. To much use, and not enough care with proper tools can hinder your ability to master the control from your cue tip to your shot.

A low hit on the cue ball (but not as low as normal draw), often used to change the cue ball's angle of deflection off the object ball.

This is a shot where the cue ball contacts an object ball and moves it along a path, but because the cue ball is still in motion it re-contacts the object ball and pushes it in the pocket after it stops.

A shot in which if the target is missed, the opponent is safe or will not have a desirable shot;
A shot in which there are two ways to score;
A shot in which a second ball is targeted to be pocketed, broken out of a cluster, repositioned or some other secondary goal is also intended.

An imaginary line running horizontally across a billiards table from the second diamond (from the foot end of the table) on one long rail to the corresponding second diamond on the other long rail. The foot string intersects the long string at the foot spot. It is rarely drawn on the table.

To win an inning that counters a good game your opponent just won.
The inning win that counters a good game your opponent just won.

This is a term used in slang to reference the bridge tool.

The point in match play where both players (or teams) need only one more game (frame) victory to win the match or race.

Principally British: In snooker, if a player wins all of the required frames in a match without conceding a frame to their opponent - for example, if a player wins a best-of-nine-frame match with a score of 5-0 - this is referred to as a "whitewash". This term is based on a similar term used in the card game of "patience" in the UK. However, it is not used in the context of a 1-0 winning scoreline in a match consisting of a single frame.