WordWeb Online

1. Be teeming, be abuzz
   "her mind pullulated with worries"
   - teem, swarm
    
2. Move in large numbers
   "beggars pullulated in the plaza"
   - pour, swarm, stream, teem
    
3. Produce buds, branches, or germinate
   - shoot, spud, germinate, bourgeon [archaic], burgeon forth, sprout, burgeon
    
4. Become abundant; increase rapidly
    
5. Breed freely and abundantly

Derived forms: pullulated, pullulates, pullulating

See also: pullulation

Type of: breed, buzz, crowd, crowd together, grow, hum, increase, multiply, seethe