proceed (v.)
- accept
- act
- advance
- arise
- assume
- attack
- attempt
- behave
- continue
- do
- elapse
- emanate
- endeavor
- endure
- expire
- fare
- flit
- flow
- fly
- function
- gain
- gate
- glide
- go
- head
- hie
- issue
- journey
- lapse
- last
- make
- maneuver
- march
- misbehave
- move
- operate
- originate
- pass
- play
- practice
- process
- progress
- renew
- repair
- resume
- rise
- roll
- run
- serve
- slide
- slip
- start
- stem
- tackle
- take
- travel
- undertake
- wend
- work
- yield
So, naturalists observe, a flea
Has smaller fleas that on him prey;
And these have smaller still to bite 'em;
And so proceed ad infinitum.