set on

US /set ɑːn/
UK /set ɑːn/
"set on" picture
1.

to cause a person or animal to attack someone or something

:
The guard set his dog on the intruder.
They set on him with sticks and stones.
2.

to begin a journey or course of action with a particular intention

:
They set on their journey early in the morning.
We need to set on a plan to address this issue.