on sight
confrontational
the one-line answer
Ready to confront someone immediately upon seeing them.
On sight means as soon as you see them, it is on. You do not need a reason in the moment. You already know what it is.
mainstream
Your coworker might use this word.
01 / in the wild
hear it move.
threat
after what he did? on sight.
I will confront or fight him as soon as I see him.