base on balls

Từ điển WordNet v3.1 - WordNet Dictionary

noun

(baseball) an advance to first base by a batter who receives four balls (Freq. 3)
- he worked the pitcher for a base on balls
• Syn:
walk, pass
• Derivationally related forms:
walk (for: walk)
• Topics:
baseball, baseball game
• Hypernyms:
accomplishment, achievement