Definitions from Wiktionary (spitball)

▸ noun:  (baseball) A pitch of a baseball that has been partly covered with saliva, illegal at most levels.
▸ noun:  A balled-up piece of paper, moistened with saliva (by chewing) and shot through a drinking straw.
▸ verb:  (baseball) To moisten the ball with saliva before pitching it.
▸ verb:  To brainstorm ideas.
▸ Also see spitball

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