in on the kill—(also: in at the kill) present at the downfall of smth. or when smth. dramatic happens:
- Congress was due to defeat the bill, and I went to Washington so I could be in on the kill.
on the kill—(of an animal) having the intention of killing (as for food):
- The bison carcass was on this side of the river in some gravel. A grizzly was on the kill…