WordNet (r) 3.0 (2006):

spill over
    v 1: overflow with a certain feeling; "The children bubbled over
         with joy"; "My boss was bubbling over with anger" [syn:
         bubble over, overflow, spill over]
    2: be disgorged; "The crowds spilled out into the streets" [syn:
       spill over, spill out, pour out]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "spill over":
   alluvion, alluvium, cascade, cataclysm, cataract, deluge, engulf,
   engulfment, fill, flood, inundate, inundation, know no bounds,
   luxuriate, overabound, overbrim, overflow, overflowing, overgrow,
   overrun, overrunning, overspill, overspread, overswarm, overwhelm,
   pour out, pour over, pullulate, run over, run riot, slop, slosh,
   spill, spill out, spillage, submerge, submersion, superabound,
   swamp, swarm, sweep, teem, the Deluge, the Flood, washout, whelm,
   whelming