proliferate (v.)
- abound
- accrue
- accumulate
- advance
- appreciate
- balloon
- beget
- bloat
- boom
- breed
- broaden
- burgeon
- copulate
- crescendo
- crossbreed
- develop
- engender
- exuberate
- father
- flow
- fructify
- gain
- generate
- get
- grow
- gush
- increase
- intensify
- mother
- mount
- multiply
- mushroom
- overflow
- pour
- procreate
- propagate
- pullulate
- rain
- reproduce
- rise
- shower
- sire
- snowball
- spread
- stream
- strengthen
- swell
- teem
- wax
- widen