drop a bomb

drop a bomb(shell)

 and explode a bombshell; drop a brick
Fig. to announce shocking or startling news. They really dropped a bombshell when they announced that the mayor would resign. Friday is a good day to drop a bomb like that. It gives the business world the weekend to recover. They must choose their words very carefully when they explode a bombshell like that. They really dropped a brick when they told her the cause of her illness.
See also: bomb, drop

drop a bomb

verb
See also: bomb, drop