Understanding the Idiom 'Off the Deep End': Meaning & Usage

"Off the deep end" is an idiom that means going too far in a negative way, or losing control. It's like going farther out into the ocean, where things are deeper and more unpredictable than they are near the surface.

A popular example of this idiom is the phrase "Going off the deep end into madness," which means going completely crazy to an extreme degree.