(一).It's gonna put your life on the line-你會有生命危險的。
This is a way of saying "You may get killed." When a person puts his life on the line, he does something risky and might get killed.
put something on the line 危及......put oneself / one's neck on the line (for somebody) 為了… )甘愿赴險 be on the line (at stake) it....
原音重現：

A: Don't go to Afghanistan. It's going to put your life on the line.
不要去阿富汗，你會有生命危險的。
B: I don't think it is as dangerous as it seems on the news.
好像沒有新聞報道的那么危險吧。

(二).It's my ass on the line.我有麻煩了。/我就要倒霉了。
This is a way to say “I'll have trouble if anything goes wrong.” The speaker feels that he will be responsible for any problems.
one's ass on the line......危險了
put one's ass on the line 危及......
I'm kind of up to my ass in problems.我現 在面臨危險。
原音重現：
A: Why won't you let me into the movie for free?
你為什么不讓我免費看電影呢？
B: It's my ass on the line if my boss finds out I did that.
如果經理知道這亊兒我就倒霉了。