Fire in the hole

Colloquial saying

"Fire in the hole" is an expression indicating that an explosive detonation in a confined space is imminent. It originated from American miners, who needed to warn their fellows that a charge had been set. The phrase appears in this sense in American state mining regulations, in military and corporate procedures, and in various mining and military blasting-related print books and narratives, e.g. during bomb disposal or throwing grenades into a confined space.

This keyword could refer to multiple things. Here are some suggestions: