put your head on the block
US /pʊt jʊər hɛd ɑn ðə blɑk/
UK /pʊt jʊər hɛd ɑn ðə blɑk/

1.
自分の首を賭ける, 責任を負う
to risk your reputation or position by supporting something or someone, especially when there is a chance of failure or criticism
:
•
I'm willing to put my head on the block for this project because I truly believe in it.
このプロジェクトのためなら、自分の首を賭けてもいい。本当に信じているからだ。
•
He put his head on the block for his team, defending their controversial decision.
彼はチームのために自分の首を賭け、彼らの物議を醸す決定を擁護した。