put/lay your head/neck on the block

lay (one's) head on the block

To assume or expose oneself to some risk, danger, or responsibility; to imperil oneself or lay oneself in harm's way; to risk damaging one's reputation. Look, I'm laying 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 lay your head on the block for no good reason. The news anchor lay his head on the block by publicly disparaging one of the presidential candidates on live television.
See also: block, head, lay, on

lay (one's) neck on the block

To assume or expose oneself to some risk, danger, or responsibility; to imperil oneself or lay oneself in harm's way; to risk damaging one's reputation. Look, I'm laying my neck 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 lay your neck on the block for no good reason. The news anchor lay his neck on the block by publicly disparaging one of the presidential candidates on live television.
See also: block, lay, neck, on

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.
See also: block, head, on, put
Farlex Dictionary of Idioms.

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!
See also: block, head, on, put
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

put your head on the block

or

put your neck on the block

If you put your head on the block or put your neck on the block, you risk your reputation or position by taking a particular course of action. When the Prime Minister called a by-election in his own constituency, he put his head on the block. He really put his neck on the block there and it's great to see his bravery being rewarded. Note: You can also say that you put your head on the chopping block. I'm not going to be the one who puts my head on the chopping block. Note: The `block' here is a special piece of wood on which a prisoner was made to place his or her head before being beheaded.
See also: block, head, on, put
Collins COBUILD Idioms Dictionary, 3rd ed.

put your head (or neck) on the block

put your position or reputation at risk by proceeding with a particular course of action. informal
This phrase alludes to the block of wood on which a condemned person was formerly beheaded.
See also: block, head, on, put
Farlex Partner Idioms Dictionary

put/lay your head/neck on the block

risk defeat, failure, etc.; put yourself in a situation where you might be blamed, criticized, etc: The government laid its head on the block and said that if it loses this vote in Parliament tonight it will call an election. I’m prepared to put my neck on the block and promise that the new building will be ready by the end of the year.In the past when people were executed (= killed as a punishment), they had to lay their head on a block so that it could be chopped off.
See also: block, head, lay, neck, on, put
Farlex Partner Idioms Dictionary
See also:
  • lay (one's) head on the block
  • lay (one's) neck on the block
  • put (one's) head on the block
  • put (one's) neck on the block
  • put head on the block
  • put your head on the block
  • put (one's) butt on the line
  • put yourself on the line
  • put (oneself) on the line