| 1. | a spherical or approximately spherical body or shape; sphere: He rolled the piece of paper into a ball. |
| 2. | a round or roundish body, of various sizes and materials, either hollow or solid, for use in games, as baseball, football, tennis, or golf. |
| 3. | a game played with a ball, esp. baseball: The boys are out playing ball. |
| 4. | Baseball. a pitched ball, not swung at by the batter, that does not pass over home plate between the batter's shoulders and knees. |
| 5. | Military.
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| 6. | any part of a thing, esp. of the human body, that is rounded or protuberant: the ball of the thumb. |
| 7. | a round mass of food, as of chopped meat, dough, or candy. |
| 8. | Slang: Vulgar. a testis. |
| 9. | balls, Slang: Vulgar.
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| 10. | bolus (def. 1). |
| 11. | Horticulture. a compact mass of soil covering the roots of an uprooted tree or other plant. |
| 12. | Literary. a planetary or celestial body, esp. the earth. |
| 13. | Mathematics. (in a metric space) the set of points whose distance from the zero element is less than, or less than or equal to, a specified number. |
| 14. | to make into a ball (sometimes fol. by up): The children were balling up snow to make a snowman. |
| 15. | to wind into balls: to ball cotton. |
| 16. | Slang: Vulgar. to have sexual intercourse with. |
| 17. | to form or gather into a ball: When the spun sugar balls, the candy has cooked sufficiently. |
| 18. | Slang: Vulgar. to have sexual intercourse. |
| 19. | ball up, Slang. to make or become utterly confused; muddle: The records had been all balled up by inefficient file clerks. |
| 20. | ball the jack, Slang.
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| 21. | carry the ball, to assume the responsibility; bear the burden: You can always count on him to carry the ball in an emergency. |
| 22. | drop the ball, to make a mistake or miss an opportunity at a critical moment. |
| 23. | keep the ball rolling, to continue or give renewed vigor to an activity already under way: When their interest lagged, he tried to keep the ball rolling. |
| 24. | on the ball,
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| 25. | play ball,
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| 26. | run with the ball, to assume responsibility or work enthusiastically: If management approves the concept, we'll run with the ball. |
| 27. | start the ball rolling, to put into operation; begin: The recreation director started the ball rolling by having all the participants introduce themselves. |

ball
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ball (so/sth) up
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ball up
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ball (bôl)
n.
A spherical object or mass.
A bezoar.
A large pill or bolus.
ball up
Roll something into a ball, as in She loved to knit and was always balling up her yarn. [Early 1800s]
Confuse or bungle, as in Jane got all balled up at the beginning of her speech, or Henry really balled up that exam. This term may come from the fact that when a horse is driven over soft or partly thawed snow, the snow becomes packed into icy balls on its hoofs, making it stumble. Another theory is that it alludes to the vulgar term balls for testicles. [First half of 1900s]