To cut the grass under BoB's feet:

slave ( P ) Pronunciation Key (slv)
n.
1. One bound in servitude as the property of a person or household.
2. One who is abjectly subservient to a specified person or influence: “I was still the slave of education and prejudice” (Edward Gibbon).
3. One who works extremely hard.
4. A machine or component controlled by another machine or component.