The buck stops here

Cultural  

1. I'm the ultimately responsible person in this organization. Other people can pass the buck to me, but I can't pass the buck to anyone else.

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buck stops here, the Idioms  

1. I'll take full responsibility, as in You needn't call my boss; the buck stops here. This saying gained fame as a sign on the desk of President Harry S. Truman. It alludes to another expression that means the opposite, pass the buck. [Mid-1900s]

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President Harry S. Truman kept a sign on his desk that read, “The buck stops here.”