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Lit., "let us await for him the evil happenings of time", i.e., brought about by time: this is the meaning given by Jawhari and Zamakhshari (in the Asas) to the expression raybal-manun (which latter word is, according to these two authorities, a synonym of dahr, "time"). In the present context, the phrase obviously denotes the expectation of the Prophet's detractors that time would prove his teachings to have been false or, at best, a delusion.
If a spiteful poet foretells evil calamities for men, men can afford to laugh at him, hoping that time will bring about its revenge, and spite will come to an evil end. For the various meanings of Raib, see n. 1884 to xiv. 9. Some Commentators suggest Death as the Calamity hatched by Time.