pullulate

(verb) be teeming, be abuzz. Synonyms: teem, swarm. Examples: "The garden was swarming with bees." "The plaza is teeming with undercover policemen." "Her mind pullulated with worries."

(verb) move in large numbers. Synonyms: pour, swarm, stream, teem. Examples: "People were pouring out of the theater." "Beggars pullulated in the plaza."

(verb) produce buds, branches, or germinate. Synonyms: shoot, spud, germinate, bourgeon, burgeon forth, sprout. Example: "The potatoes sprouted."

(verb) become abundant; increase rapidly.

(verb) breed freely and abundantly.