Definition of Mushroom

This is a blemish added to the table in order to help execute a shot; these marks are not allowed and result in a foul.

Also sidespin, side-spin, side. spin placed on the cue ball when hit with the cue tip to the left or right of the ball's center; usually called english in American usage. See english, in its narrower definition, for details on the effects of side spin.

Same as suit, predominantly in British terminology, i.e., in eight-ball either of the set of seven balls (reds or yellows) that must be cleared before potting the black. Generally used in the generic, especially in rulesets or articles, rather than colloquially by players.

The break box is a zone in the "kitchen" of the head (British: bottom) of the table, from which the break shot must be taken with the cue ball,

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.

This is to intentionally foul by slightly moving the ball, or playing another type of illegally defensive shot in a game where the ball is just turned over to the other player. Like in one pocket, you still take the foul, but can leave the other player with a challenging shot.

Also known as a "power draw", means applying very powerful draw on the cue ball thereby causing the maximum amount of draw.

In snooker, the second-highest value colour ball, being worth six points.

A deliberate foul that leaves the balls in a safe position, reducing the risk of giving a frame-winning chance to the opponent. The miss rule in snooker was implemented primarily to discourage the professional fouls.

A gentle tap of the cue ball with the intention of getting it as tight as possible behind another ball, in the hope of a snooker. It is most common in the game of snooker, and is illegal in many pool games, in which on every shot a ball must either be pocketed, or some ball must contact a cushion after the cue ball has contacted an object ball.

Chiefly American: The cushion on the head rail. Compare bottom cushion; contrast foot cushion.

In blackball, a penalty conceded by a player after a fault. The incoming opponent is then allowed to miss twice before the faulting player is allowed another visit. Many local rules state the in-hand from the "D" or baulk (or if the opponent potted the cue ball, from anywhere) nature of the second shot is lost if a ball is potted on the first shot, that it is lost if the ball potted in the first shot was that player's last coloured ball (object ball in their group), and/or that there is only ever one shot on the black after a fault.

A defensive action taken when a player either has no "makeable" or "high percentage" shot or chooses to leave his opponent in a difficult situation. It is a legal shot and is not considered to be dirty pool. A safety must still conform with the rule concerning hitting the correct ball first and striking a rail afterwards. If a correct ball is accidentally pocketed while playing safe, the shooter must continue to shoot.

United States Professional Poolplayers Association The United States Professional Poolplayers Association (UPA) is the governing body for the sport of men's professional pool (pocket billiards) in the United States, in conjunction with the World Pool-Billiard Association (WPA) and its US-national affiliate, the Billiard Congress of America (BCA). Founded in 2002, the association is based in Phoenix, Arizona.

Also semi-massé shot. A moderate curve imparted to the path of the cue ball by an elevated hit with use of english (side); or a shot using this technique. Also known as a curve (US) or swerve (UK) shot. Compare massé.

In snooker, the highest-value colour ball on the table, being worth seven points. In some (especially American) snooker ball sets it is numbered "7" on its surface.
The black ball (usually numbered "8") in the eight-ball variant game blackball (and its variants); also the common British term for the slightly larger but otherwise identical 8 ball in a kelly pool set (a.k.a. American or WPA pool set).

Given to the opposite player after a scratch on the cue ball has been played. This means the player with the cue ball in hand can position it wherever on the table he pleases. Sometimes there are restrictions as to where on the table the ball can be placed: in the kitchen, within the half circle, within the D. This is also known as cue ball in hand.

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

This is a match where a player must win so many games more than the other player in order to win the match.

A break shot in which the rack (pack) is disturbed as little as possible within the bounds of a legal shot, in order to force the opponent to have to break it up further. A soft break is desirable in some games, such as straight pool, in which breaking is a disadvantage; and forbidden by the open break rules of other games such as nine-ball and eight-ball.

Same as follow (top spin).

Modification of the rules and/or scoring of a game to enable players of variable abilities to compete on a more even playing field. Examples of handicapping include spotting balls and giving games on the wire to an opponent. In league play, other forms of handicapping include awarding compensating points to a lesser-skilled team, or using numerical player ranking systems to adjust final scores between opponents of different skill levels.

This is when a ball is spotted because of a foul or a handicap.

A material, usually leather, placed on the end of a cue stick that comes in contact with the cue ball.