Base on Balls

A base on balls (BB) is credited to a batter and against a pitcher in baseball statistics when a batter receives four pitches that the umpire calls balls. It is better known as a walk. The base on balls is defined in Section 2.00 of baseball's Official Rules, and further detail is given in 6.08(a). It is called a "walk" because the batter is then entitled to walk to first base, or more specifically (as defined in the rules of baseball) he is "entitled to first base without liability to be put out." If a runner is on first base when the batter draws a walk he advances one base to make way for the batter to take first. If there are runners on first and second they both advance one base, and if the bases are loaded all three batters advance, with the runner on third advancing home to score a run. In the latter, bases loaded walk situation, the batter is credited with an RBI per rule 10.04.
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Noun
1. (baseball) an advance to first base by a batter who receives four balls; "he worked the pitcher for a base on balls"
(synonym) walk, pass
(hypernym) accomplishment, achievement
(classification) baseball, baseball game, ball