/ˈbɒmʃel ||; ˈbɑmˌʃɛl/noun [C] [usu.sing] an unexpected piece of news, usually about sth unpleasant 意外的消息（通常指令人不快的）: The chairman dropped a bombshell when he said he was resigning. 主席说要辞去职务，引起了一阵骚动。