Synonyms for overflow

noun

1. The act of overflowing

   inundation, exuberance, overproduction, congestion, deluge, spillover, overabundance, engorgement, flooding, spilling over, submergence, submersion, overspreading, superabounding, overcrowding, redundancy, push, propulsion, encroachment, advance, infringement, overtopping, overwhelming, overbrimming; see also flood 1.

   Antonyms lack*, deficiency, scarcity.

2. That which overflows

   superfluity, surplus, surplusage; see excess 1.

3. The vent through which overflow occurs

   outlet, passage, exit; see hole 1, 2.

verb

1. To flow over the top, or out at a vent

   spill over, fall, run out, run over, pour out, pour over, waste, shed, cascade, spout, spout forth, jet, spurt, drain, leak, squirt, spray, shower, gush, shoot, issue, rush, irrupt, wave, surge, overtop, overbrim, brim over, lap over, bubble over, flow over; see also flow 2, spill.

2. To flow out upon

   inundate, water, wet; see flood.