Dic: The buck stops here

• The buck stops with him. He is ultimately responsible for every aspect of the broadcast.
• After everyone else has avoided making the decision, I will have to do it. The buck stops here.

10. PHRASE : V inflects | If you say `The buck stops here' or `The buck stops with me', you mean that you have to take responsibility for something and will not try to pass the responsibility on to someone else.[INFORMAL]

The need to act or take responsibility, that other people pass on to still other people, ultimately ends up here. (An expression made famous by U.S. President Harry Truman, about the finality of decisions a president must make. See also pass the buck.

... Cobuild, http://idioms.thefreedictionary.com/buck+stops+here