put head on the block
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put (one's) head on the block
To assume or expose oneself to some risk, danger, or responsibility; to imperil oneself or put oneself in harm's way; to risk damaging one's reputation as the result of doing something. Look, I'm putting my head on the block for you here. I could get fired if they find out what we're up to! You have to take some risks to be successful in business and in life, but don't put your head on the block for no good reason.
put one's head on the block (for someone or something)
Fig. to take great risks for someone or something; to go to a lot of trouble or difficulty for someone or something; to attempt to gain favor for someone or something. I don't know why I should put my head on the block for Joan. What has she ever done for me? Sally tried to get me to put in a good word about her with the boss. But the last time I put my head on the block for anyone, it all backfired, and when the person goofed up, I looked like an idiot!