The idiom "train of thought" originated from the idea that thoughts can be linked together like a series of train cars connected on a track. It was first used in the early 16th century and has since become a common metaphor for the flow of one's ideas or mental processes. This expression is used to describe the sequence of connected thoughts or ideas that run through a person's mind as they think about a particular topic or problem.

What is the origin of the idiom "train of thought" and when to use it?

英語での「train of thought 」の定義と意味

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