drop a bombshell
突然公布或發表一個令人震驚或吃驚的消息或事實
口語·正式場合，表示突然宣布震驚消息
英文釋義
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.
典故來源
源自戰爭時期投擲炸彈的比喻，炸彈落下會帶來巨大沖擊和破壞，引申為突然宣布令人震驚的消息。