Smash a Single Digit

Crunch a number
Grinds your gears
Crunch a number
Root out a stiff
Then tightly squeeze
Wretch after wretch

Non-expressive matter
Designated to perish
Smash a single digit
Wretch follows wretch

Cleave to progress, rotate the cull
Cleave to progress, this ranks
Lower than collateral
Louse after louse

Non-reflective minions
Who must labour and perish
Smash a single digit
Louse follows louse

As there is no lower to plunge
No heed is paid to consequences
There's no sum when
You're not a part