drop a bombshell
突然公布或发表一个令人震惊或吃惊的消息或事实
口语·正式场合，表示突然宣布震惊消息
英文释义
to reveal a shocking or unexpected piece of news or information
例句
She dropped a bombshell at the meeting by announcing she was quitting her job.
典故来源
源自战争时期投掷炸弹的比喻，炸弹落下会带来巨大冲击和破坏，引申为突然宣布令人震惊的消息。