Ορισμός και Σημασία του "[drop|explode] a bombshell"

What is the origin of the idiom "drop a bombshell" and when to use it?

The phrase "drop a bombshell" is an idiom with its origins in the literal dropping of bombs during wartime. Figuratively, it is used to describe the act of revealing shocking or highly significant news or information that has a powerful and often unsettling impact on those who receive it.