pullulate

verb

1. 1

   breed freely and abundantly

2. 2

   become abundant; increase rapidly

3. 3

   produce buds, branches, or germinate

   the potatoes sprouted

4. 4

   move in large numbers

   beggars pullulated in the plaza

   people were pouring out of the theater

5. 5

   be teeming, be abuzz

   The garden was swarming with bees

   The plaza is teeming with undercover policemen