Verb
1. be teeming, be abuzz;
"The garden was swarming with bees""The plaza is teeming with undercover policemen""her mind pullulated with worries"2. move in large numbers;
"people were pouring out of the theater""beggars pullulated in the plaza"3. produce buds, branches, or germinate;
"the potatoes sprouted"4. become abundant; increase rapidly
5. breed freely and abundantly