all hell breaks/is let loose
all hell breaks loose
slang Said of a chaotic or disruptive situation, especially one that begins suddenly or unexpectedly. I'm just walking down the street when all hell breaks loose, and drivers start beeping and screaming at each other for no apparent reason. One guy pushed another at the bar and then all hell broke loose—that's why we left!
all hell breaks looseor
all hell breaks outINFORMAL
COMMON If all hell breaks loose or all hell breaks out, a situation becomes uncontrolled and noisy, often with a lot of arguing or fighting. Suddenly, all hell broke loose upstairs. It sounded as if someone was battering at the door with a tree trunk. Toby came home and all hell broke loose. I had no idea that a baby could scream so much. Note: This expression first appeared in John Milton's `Paradise Lost' (1667), book 4, line 917, when the Archangel Gabriel addresses Satan: `Wherefore with thee Came not all hell broke loose?' (ie why did all hell not break loose and come with you?). Here, `broke' means `broken', but the meaning of this expression has since changed.