The harsh winter helped to kill off the insect population
Scientists are trying to find ways to kill off the harmful bacteria
The company plans to kill off several less profitable product lines
A disease could potentially kill off the entire herd if not contained
We need to kill off the weeds in the garden before they take over
The new medication is designed to kill off cancer cells
Environmental changes can kill off delicate plant species
The farmers had to kill off their livestock during the outbreak
They decided to kill off the old computer system and replace it
A sudden frost can kill off young shoots
The hero was too important to kill off so early.
I agree, it felt like a cheap trick.
They should have saved that for a later act.
The disease threatened to kill off the entire population
The illness could have wiped out all the people
The plague risked the complete eradication of the populace