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./