overflow (subs.) Copy link • overflow (subs.): expr. by verb: in consequence of an o. of the Tiber, effuso per ripas Tiberi flumine; quum Tiberis agros inundasset, etc.: v. to overflow. See also inundation. (Sometimes auctus, ūs, may be precise enough: e. g. concerning the causes of the o. of the Nile, *de causis Nili auctus.)