death blow (also death-blow)

• 1. 

  N-SING If you say that an event or action deals a death blow to something such as a plan or hope, or is a death blow to something, you mean that it puts an end to it. 致命一击 [journalism] [oft N 'to' n]

  例：

  The deportations would be a death blow to the peace process.

  驱逐将会是对和平进程一个致命打击。