In snooker, a shot that goes into a pocket after striking another ball (2-3)
I believe the answer is:
in-off
(Other definitions for in-off that I've seen before include "Shot that's good at billiards and foul at snooker" , "Glancing billiards pot" , "Foul (snooker), scoring stroke (billiards)" , "Indirect billiards shot" , "Losing hazard at billiards" .)