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Glossary of baseball (J) facts for kids

Kids Encyclopedia Facts



The run the pitcher takes from the mound to first base in order to cover for the first baseman who has just fielded the ball.


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."
  • The "bases are jammed" (or loaded or full) when there are runners on all three.

janitor throw

When an outfielder, trying to throw hard, spins or falls down.


A Punch and Judy hitter who hits with little power.


  • 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."

Junior Circuit

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 hard to hit due to movement rather than velocity. "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

junkball pitcher

A pitcher who throws predominantly junk, usually due to a weak (or slow) fastball. A junkballer or a junk artist: "Like all junk artists, Trujillo will have to prove himself at the higher levels before getting a shot at a major league job." See also: Eephus pitch
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Glossary of baseball (J) Facts for Kids. Kiddle Encyclopedia.