Baseball Terms Glossary
(Starting with "J")
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This is an alphabetical list of selected unofficial and specialized terms,
phrases, and other jargon used in baseball, and their
definitions, including illustrative examples for many entries.
- A home run or to hit a home run. "Hitting a jack" or "Jacking
one out of here."
- Half-hearted or lazy effort by a player, i.e. "He jaked that play."
- To pitch far enough inside that the batter is unable to extend
while swinging. "The pitcher jammed the batter". The batter
was "handcuffed" or "shackled" by the pitch.
- When runners are in scoring position with less than two outs and
good hitters coming up. "The pitcher is in a jam."
- "Bases are jammed" means "bases are full." There are runners on
1st, 2nd, and 3rd bases. Sometimes referred to as a "jam sandwich."
- When a batter is fooled by a pitch (normally an off-speed or curve
ball heading at an unusual angle) and departs from a good batting stance.
“His curve ball . . . it jelly-legs you.” - Phillies First Baseman Jim
Thome, referring to Barry Zito.
- To hit the ball hard, typically used to refer to pulling the ball
over the fence for a home run. "Lee jerked one of his patented
doubles into the left-field corner against Mets lefty Johan Santana."
- A Punch and Judy hitter who hits with little power.
- "Bases juiced" means bases loaded.
- A player who is said to be juiced is thought to be taking performance
enhancing drugs. "It is now assumed, of course, that Bonds
may well have been juiced on steroids at the time; the previous
year he had set the all-time single-season record of 73 home runs,
and his musculature was almost freakishly swollen."
- A baseball that is said to be juiced is doctored or manufactured
in some way that makes it travel farther when a batter hits it.
"Spectacular increases in home runs have often raised the question:
Has the ball been juiced up to travel farther, in order to increase
the number of home runs?"
- A fielder is said to get a good jump on the ball when he
anticipates or reacts quickly to a batted ball and is thereby able
to make a good play by fielding or catching it.
Also see crack of the bat.
- A baserunner gets a good jump when he is able to leave
the base well before the pitch reaches the plate. "Upsetting the
timing of the baserunner can effectively prevent him from getting
a good jump.... Base runners often read a pitcher's look and get
their jump, or start, based on the pattern the pitcher establishes."
- The American League, so-called because it is the younger of the two
major leagues. The American League was founded in 1901, while the National
League – the Senior Circuit – was founded in 1876.
- breaking balls and knuckleballs, pitches that are difficult to
hit due to movement rather than velocity. The term is also used
to describe a "junk pitcher" or a junkball pitcher. "I
couldn't believe he threw me a fastball because he had me down 1-2,"
Thames said. "He's usually a junk pitcher and he tried to sneak
a fastball past me, and he left it up." See also: Eephus pitch
See all sports glossaries:
Published - February 2011
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