(one's) butt is on the line
(one's) butt is on the line
One's reputation, livelihood, wellbeing, or life is at stake. My butt is on the line, so this presentation has to go well! Their butt is on the line out there, so let's give them the air support they need.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.