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The idiom "pass the buck" means to shift responsibility, blame, or burden onto someone else, often by transferring an object (such as a dollar bill) from one person to another. The literal meaning is that when a cowboy received a task he didn't want to do, he would pass a buck to the person next to him, indicating that the other person should take care of it instead. In contemporary language, the idiom is often used in a metaphorical sense to describe how people try to avoid taking responsibility for their actions or decisions.
The origin of the idiom "pass the buck" is believed to have come from cowboy culture in the late 1800s. Cowboys would often receive tasks they didn't want to do, such as taking care of a sick horse or cleaning up after a messy campfire. To avoid these tasks, cowboys would pass a dollar bill (a "buck") to the person next to them, indicating that they should take care of it instead. Over time, the idiom evolved to mean shifting responsibility in a more metaphorical sense, and it became commonly used in contemporary language.