Definition of Crutch

This is placed on a ball by hitting it slightly below center. This action makes the ball travel in a motion against its originally hit direction.

In snooker, any of the three colour balls that get spotted on the baulk line: the yellow, green or brown ball.

This is a table that offers poor conditions for play; it is either dirty, wet, or overall poor quality.

Pronounced "No-Rango". A norengo refers to what should be an easy straight in shot where the object ball is usually very close to the pocket. But the shooter strikes the ball harder than they should and the result is the object ball rattling out of the pocket and a missed shot.
Also see Lorengo.

To shoot without taking enough warm-up strokes to properly aim and feel out the stroke and speed to be applied. One-stroking is a common symptom of nervousness and a source of missed shots and failed position.

This is the imaginary line that a ball would need to follow in order for it to result in an effective bank shot.

See overcut.

In team match play when playing one-on-one matches, if one team is short a player, a player on that team is called back to play a second match.
For example: Team A has 6 players, Team B has 4 players. There will be five individual matches played. For the fifth match Team A can pick a player from Team B to play a second match against their fifth match player.

When playing 9 Ball, a dead ball is an object ball the falls into a pocket when a foul has been committed (for example, the shooter scratches or does not hit the lowest ball first). If keeping score by counting balls fallen, neither player gets the point for that ball.

Describing a difficult pot: "the awkward cueing makes this shot missable."

This is English that turns into reverse English after contact with the object ball. This will close up the angle on a bank.

Balls remain unmoved after a player's shot.

As an adjective or compound noun: push-out. A rule in many games (most notably nine-ball, after and only after the break shot), allowing a player to "push out" the cue ball to a new position without having to contact any ball, much less pocket one or drive it to a cushion, but not counting any pocketed ball as valid (other foul rules apply, such as double hits, scratching the cue ball, etc.), with the caveat that the opponent may shoot from the new cue ball position or give the shot back to the pusher who must shoot from the new position. In nine-ball particularly, and derived games such as seven-ball and ten-ball, pocketing the money ball on a push-out results in that ball being respotted (which can be used to strategic advantage in certain circumstances, such as when the break leaves no shot on the ball-on, and failure to hit it would give the incoming player an instant-win combination shot on the money ball).

This is a type of shot that is executed by an object ball caroming off of another object ball in order to gain the pocket.

Same as stripes, in New Zealand. Compare yellows, high, big ones; contrast unders.

When you have completed a shot by pocketing a ball into a pocket.

The precise center of the pool table.

Nine Ball is a rotation game so a player must hit the lowest numbered ball first.
The object of the game is pocket the 9-ball on any legal shot.

Any mechanical aid that serves to extend the length of the player's cue, normally added to the end of the butt either by clipping around the end or screwing into the base. Though extensions are used for pool, it is more common in snooker because of the significantly larger table size.
In a tournament where players get limited time to make their shots (common in televised matches), an extension is extra time granted before making a shot; players have a limited number of extensions in each frame.

A pool table spread in which the balls are extremely easily positioned for a run out, and where little movement of the cue ball on each shot is necessary to obtain position on the next.

Cut Throat is a game of pocket billiards created to support three or five players. Balls are assigned to each player, and the purpose is to sink all the opponent's balls first to eliminate the other players.

To contact the chosen object ball in such a way to make it bank off a rail before being pocketed.

When the cue ball contacts three or more cushions in carom games.

This is a certain type of system used to determine who plays first in the next game. These methods are not synonymous with pool skills, and are more along the lines of flipping a coin, paper-rock-scissors, or drawing straws.