The idiom "loose cannon" originated from nautical terminology. In the era of sailing ships, a "loose cannon" referred to a cannon that had broken free from its moorings during naval battles. It is used to describe a person who is unpredictable, impulsive, and not under control, often acting in a way that can cause harm or problems.

What is the origin of the idiom "loose cannon" and when to use it?

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“loose cannon”的英语定义和含义

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