gumball

gum +‎ ball

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gumball (plural gumballs)

1. Chewing gum sold as a ball usually coated with colored hard sugar.

   Remember those clear globe dispensers with gumballs for a penny?

2. (slang) A silly, laughable person.

   Synonym: goofball

   When he drinks too much he's a gumball.

3. (US, slang) The flashing lights on top of a police car.
4. The spiky seedpod of the sweet gum tree.

   Synonym: monkey ball

• gumball machine