1. breed freely and abundantly

2. become abundant
increase rapidly

3. produce buds, branches, or germinate

e.g. the potatoes sprouted

Synonym: shootspudgerminatebourgeonburgeon forthsprout

4. move in large numbers

e.g. people were pouring out of the theater
beggars pullulated in the plaza

Synonym: pourswarmstreamteem

5. be teeming, be abuzz

e.g. The garden was swarming with bees
The plaza is teeming with undercover policemen
her mind pullulated with worries

Synonym: teemswarm