explode a bombshell

explode a bombshell or drop 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.
Categories: informal verb