coach killer

noun3

1. •
   (US) A player who apparently causes coaches to be sacked.

   • "I think Pat McAfee made a good choice; this guy's hardly a coach killer; he's only played for three in 20 years," Lupica said. — 2024
2. •
   A performance that results in a coach's sacking.

   • The future of Michael Voss is under intense questioning yet again after another horror result for Carlton against North Melbourne with Campbell Brown labelling the 11-point defeat a "coach killer". — 2025
3. •
   (Australia) A particularly frustrating, usually simple mistake made by a player.

   • The counterattack is swift and should result in a goal but Miers drops a chest mark uncontested! […] That was a coach killer. — 2020