Overflow  —v. 1 flow over (the brim etc.). 2 a (of a receptacle etc.) Be so full that the contents overflow. B (of contents) overflow a container. 3 (of a crowd etc.) Extend beyond the limits of (a room etc.). 4 flood (a surface or area). 5 (of kindness, a harvest, etc.) Be very abundant. —n. 1 what overflows or is superfluous. 2 outlet for excess water etc.