pullulate /pulˈū-lāt/

1. To sprout
2. To sprout or breed abundantly
3. To teem
4. To increase rapidly

• half-mast
• half masts
• half measure
• half measures
• half-miler
• half-milers
• half-moon
• half-moons
• half-mourning
• half nelson
• half-note
• half-notes
• half-one
• halfpace
• halfpaces
• half past
• half pay
• half-pay
• halfpence
• halfpennies
• halfpenny
• halfpennyworth
• halfpennyworths
• half-pie
• half-pike