spitball

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a projectile made by chewing a piece of paper and shaping it into a sphere
• Hypernyms:
projectile, missile
2. an illegal pitch in which a foreign substance (spit or Vaseline) is applied to the ball by the pitcher before he throws it
• Syn:
spitter
• Hypernyms:
pitch, delivery