You might pretend to throw an invisible one to fool your dog

noun

1. A spherical or ovoid body used in a game or sport

   "a tennis ball"

2. Earth, globe
3. A spherical or conical projectile
4. A roundish protuberant anatomical structure (as near the tip of a human finger or toe or at the base of a thumb)
5. Testis
6. A game in which a ball is thrown, kicked, or struck
7. A pitch not swung at by the batter that fails to pass through the strike zone
8. A hit or thrown ball in various games

   "foul ball"

verb

1. To form or gather into a ball

   "balled the paper into a wad"

2. To have sexual intercourse with
3. To form or gather into a ball
4. To engage in sexual intercourse
5. To play basketball

   "Common shot all his own scenes on the hardwood, balling against NBA superstars Dwyane Wade and Dwight Howard."

noun

1. A large formal gathering for social dancing
2. A very pleasant experience a good time

   "everyone had a ball at the wedding"

biographical name

1. John died 1381 English priest and social agitator

biographical name

1. Lucille (Désirée) 1911–1989 American actress and comedienne

noun

1. A joint in which a ball moves within a socket so as to allow rotary motion in every direction within certain limits
2. An articulation (such as the hip joint) in which the rounded head of one bone fits into a cuplike cavity of the other and admits movement in any direction

noun

1. A bearing in which the journal turns upon loose hardened steel balls that roll easily in a race

noun

1. A male attendant who retrieves balls for players or officials (as in a tennis match or a baseball or basketball game)

noun

1. An automatic valve whose opening and closing are controlled by a hollow float at the end of a lever

noun

1. An offensive strategy (as in football) in which a team tries to keep possession of the ball for extended periods of time