game ball noun 2adjective 1forms 3 noun2 •A ball used to play a game or sport; (North America) the ball used to play a particular match, often presented to a player etc. as a trophy. •A position (especially in racquet sports) in which a single point is required to win. adjective1 •(Ireland, slang) In good spirits; great, excellent.—That'll do, game ball, Blazes Boylan said. — 1922 formsgame balls · more game ball · most game ball