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wind·up / ˈwīndˌəp/ • n. 1. an act of concluding or finishing something: the windup of the convention.2. Baseball the motions of a pitcher immediately before delivering the ball, in which they take a step back, lift the hands over the head, and step forward.• adj. (of a toy or other device) functioning by means of winding a key or handle: a windup clock.