The idiom "on a roll" is thought to have originated in the 19th century. It is believed to be a reference to the fact that a rolling ball is difficult to stop. In other words, when someone is "on a roll," they are doing well and are likely to continue to do well. The idiom is often used to describe someone who is successful or who is doing well in a particular area.

What is the origin of the idiom "on a roll" and when to use it?

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“on a roll”的英语定义和含义

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