Etymology
The term "jack in the box" has its origins in the 16th century, when it referred to a mechanical device that contained a spring-loaded figure. When the box was opened, the figure would pop out, hence the name "Jack in the box."
Meaning
A "jack in the box" is a toy or device that consists of a box with a spring-loaded mechanism that causes a figure or other object to pop out when the box is opened.
Origin
The exact origin of the "jack in the box" is unknown, but there are several theories.
Over time, the term "jack in the box" has also been used figuratively to refer to something that is unexpected, startling, or amusing. For example, a person who suddenly appears or acts in an unpredictable way might be referred to as a "jack in the box."
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