Definition of Upa

This is to use running english or soft speed in order to open up the angle on a particular bank shot.

Area on the corner of a carom table, which is defined by a line between the second diamond on the side rail and the first diamond on the end rail, where only three successive points are allowed before the object ball must be cleared out of the area.

When an opponent either purposely successfully executes a defensive shot or misses their shot resulting in a bad leave for the next player.
Example: "I was left bad every time he missed his shot".

This is to execute a shot where the cue ball is controlled perfectly and stops where you want it to exactly.

Using knowledge of the game and one's own abilities and limitations to choose the manner of shooting and the particular shot from an array presented, that has a degree of likelihood of success. This often requires a player to forego a shot that if made would be very advantageous but does not have a high likelihood of success, in favor of a safety or less advantageous shot that is more realistically achievable.

The normal phenomenon where the object ball is pushed in a direction very slightly off the pure contact angle between the two balls. Caused by the friction imparted by the first ball sliding past or rotating against the other ball.

Used with an amount to signify money added to a tournament prize fund in addition to the amount accumulated from entry fees (e.g. "$500 added").

The number of balls pocketed in an inning in pool (e.g., a run of five balls), or points scored in a row in carom billiards (e.g., a run of five points). Compare British break (sense 2), which is applied to pool as well as snooker in British English.

This is to watch a match with such intensity that there is worry, usually because of a wager on the game.

A shot where the cue ball has no top spin or back spin on it when it impacts an object ball, and "stuns" out along the tangent line. Commonly shortened to just "stun."

One of the alternating turns players (or doubles teams) are allowed at the table, before a shot is played that concedes a visit to his/her opponent (e.g. "he ran out in one visit"). Usually synonymous with inning as applied to a single player/team, except in scotch doubles format.

A shot in which the cue ball is struck above its equator with sufficient top spin to cause the cue ball to travel forward after it contacts an object ball. When a cue ball with follow on it contacts an object ball squarely (a center-to-center hit), the cue ball travels directly forward through the space previously occupied by the object ball (and can sometimes even be used to pocket a second ball). By contrast, on a cut shot, a cue ball with follow on it will first travel on the tangent line after striking the object ball, and then arc forward, widening the carom angle.

Three Cushion is a form of carom billiards.
The object of the game is to carom the cue ball off both object balls and contact the rail cushions at least 3 times before the last object ball. A point is scored for each successful carom.

This is the act of keeping your ball location advantages the way they are, and not allowing your opponent to even things out in the game of one pocket.

Also (chiefly British) shot programme. The enumerated trick shots that must be performed in the fields of artistic billiards (70 pre-determined shots) and artistic pool (56 tricks in 8 "disciplines").

In certain carom billiards games, any shot in which the cue ball is sucessfully caromed off an object ball to strike another object ball (with or without contacting cushions in the interim) is a considered a billiards shot.

Balls remain unmoved after a player's shot.

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.

The way in which a player holds the butt end of the cue stick.
The wrap of the cuestick where the hand is placed, also known as the "grip area."

Principally US: One or more sets, usually in the context of gambling. See also ahead race (a.k.a. ahead session) for a more specialized usage.
Principally British: Any of a group of pre-determined frames played in a match too long to be completed within a single day's play. A best of 19 frame match, for example, is generally played with two "sessions", the first composed of nine frames, the second of ten. This term is generally used only in the context of professional snooker, as matches at the amateur level are rarely played over more than nine frames. Longer matches can be split into three or four sessions.
In the APA and CPA Leagues, session refers to the season in which League play took place. There are three sessions in each League Year-Summer Session, Fall Session and Spring Session.

Local Bylaws are additional rules, policies, and procedures unique to an area in addition (or subtraction) to established Pool/Billiards/Snooker league rules. They are designed to cover local situations.

See two-shot carry.

This is to have control on the cue ball in your shots.

Nearly table-length distance between the cue ball and target object ball, or near cue and object balls and target pocket, i.e. a potentially difficult shot ("you sure left me a lot of green on that one").
The cloth covering the table.