explode a bombshell v. phr.,
informal To say something startling; suggest or show something astonishing or shocking,
The police exploded a bombshell when they arrested the kindly old banker for stealing money from the bank. The principal exploded a bombshell by cancelling the dance as a penalty. Political leaders exploded a bombshell when they picked the young lawyer to run for mayor. [TahlilGaran] English Idioms Dictionary ▲