What Is A “Brass Monkey”??

. A “Brass Monkey” is an expression that came from British naval slang, referring to a metal plate formerly used to hold gunpowder.

This metal plate was also used to store cannon and musket balls, and was mounted on the quarterdeck of many ships. It was called a “Brass Monkey” because its shape was similar to that of a monkey, with its four legs standing on a flat surface.

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